16156021572 has 72 divisors (see below), whose sum is σ = 41663015576. Its totient is φ = 5277602304.

The previous prime is 16156021543. The next prime is 16156021577. The reversal of 16156021572 is 27512065161.

16156021572 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 60 + 21 + 572 = 666.

16156021572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3909500676 + 12246520896 = 62526^2 + 110664^2 .

It is a super-2 number, since 2×16156021572² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16156021577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393018 + ... + 432174.

Almost surely, 2^16156021572 is an apocalyptic number.

16156021572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16156021572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20831507788).

16156021572 is an abundant number, since it is smaller than the sum of its proper divisors (25506994004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16156021572 is a wasteful number, since it uses less digits than its factorization.

16156021572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39397 (or 39392 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 16156021572 in words is "sixteen billion, one hundred fifty-six million, twenty-one thousand, five hundred seventy-two".