16565406040 has 16 divisors (see below), whose sum is σ = 37272163680. Its totient is φ = 6626162400.

The previous prime is 16565406029. The next prime is 16565406073. The reversal of 16565406040 is 4060456561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207067536 + ... + 207067615.

It is an arithmetic number, because the mean of its divisors is an integer number (2329510230).

Almost surely, 2^16565406040 is an apocalyptic number.

16565406040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16565406040 is an abundant number, since it is smaller than the sum of its proper divisors (20706757640).

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

16565406040 is a wasteful number, since it uses less digits than its factorization.

16565406040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414135162 (or 414135158 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 16565406040 in words is "sixteen billion, five hundred sixty-five million, four hundred six thousand, forty".