16121506572 has 96 divisors (see below), whose sum is σ = 44289201600. Its totient is φ = 5053833216.

The previous prime is 16121506561. The next prime is 16121506649. The reversal of 16121506572 is 27560512161.

16121506572 is a `hidden beast` number, since 1 + 61 + 21 + 5 + 0 + 6 + 572 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3216004 + ... + 3221012.

It is an arithmetic number, because the mean of its divisors is an integer number (461345850).

Almost surely, 2^16121506572 is an apocalyptic number.

16121506572 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 16121506572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22144600800).

16121506572 is an abundant number, since it is smaller than the sum of its proper divisors (28167695028).

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

16121506572 is a wasteful number, since it uses less digits than its factorization.

16121506572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792 (or 6784 counting only the distinct ones).

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

The spelling of 16121506572 in words is "sixteen billion, one hundred twenty-one million, five hundred six thousand, five hundred seventy-two".