16356645972 has 36 divisors (see below), whose sum is σ = 41351165856. Its totient is φ = 5451529680.

The previous prime is 16356645953. The next prime is 16356645979. The reversal of 16356645972 is 27954665361.

16356645972 is a `hidden beast` number, since 1 + 6 + 3 + 566 + 4 + 5 + 9 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16356645979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319897 + ... + 367487.

It is an arithmetic number, because the mean of its divisors is an integer number (1148643496).

Almost surely, 2^16356645972 is an apocalyptic number.

16356645972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16356645972 is an abundant number, since it is smaller than the sum of its proper divisors (24994519884).

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

16356645972 is a wasteful number, since it uses less digits than its factorization.

16356645972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57148 (or 57143 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 16356645972 in words is "sixteen billion, three hundred fifty-six million, six hundred forty-five thousand, nine hundred seventy-two".