16566021072 has 80 divisors (see below), whose sum is σ = 48656498880. Its totient is φ = 5393582208.

The previous prime is 16566021049. The next prime is 16566021107. The reversal of 16566021072 is 27012066561.

It is a happy number.

16566021072 is a `hidden beast` number, since 1 + 6 + 566 + 0 + 21 + 0 + 72 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427323 + ... + 464474.

It is an arithmetic number, because the mean of its divisors is an integer number (608206236).

Almost surely, 2^16566021072 is an apocalyptic number.

16566021072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16566021072 is an abundant number, since it is smaller than the sum of its proper divisors (32090477808).

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

16566021072 is a wasteful number, since it uses less digits than its factorization.

16566021072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891857 (or 891845 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 16566021072 in words is "sixteen billion, five hundred sixty-six million, twenty-one thousand, seventy-two".