16564081475 has 24 divisors (see below), whose sum is σ = 20972184480. Its totient is φ = 12974987520.

The previous prime is 16564081451. The next prime is 16564081477. The reversal of 16564081475 is 57418046561.

It is not a de Polignac number, because 16564081475 - 2¹⁰ = 16564080451 is a prime.

It is a super-2 number, since 2×16564081475² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16564081477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193037 + ... + 265313.

It is an arithmetic number, because the mean of its divisors is an integer number (873841020).

Almost surely, 2^16564081475 is an apocalyptic number.

16564081475 is a deficient number, since it is larger than the sum of its proper divisors (4408103005).

16564081475 is a wasteful number, since it uses less digits than its factorization.

16564081475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72479 (or 72474 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 16564081475 in words is "sixteen billion, five hundred sixty-four million, eighty-one thousand, four hundred seventy-five".