36644430665 has 16 divisors (see below), whose sum is σ = 46673865360. Its totient is φ = 27523614720.

The previous prime is 36644430601. The next prime is 36644430673. The reversal of 36644430665 is 56603444663.

It can be written as a sum of positive squares in 8 ways, for example, as 8803505929 + 27840924736 = 93827^2 + 166856^2 .

It is not a de Polignac number, because 36644430665 - 2⁶ = 36644430601 is a prime.

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, 492266 + ... + 561795.

It is an arithmetic number, because the mean of its divisors is an integer number (2917116585).

Almost surely, 2^36644430665 is an apocalyptic number.

It is an amenable number.

36644430665 is a deficient number, since it is larger than the sum of its proper divisors (10029434695).

36644430665 is a wasteful number, since it uses less digits than its factorization.

36644430665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054492.

The product of its (nonzero) digits is 3732480, while the sum is 47.

The spelling of 36644430665 in words is "thirty-six billion, six hundred forty-four million, four hundred thirty thousand, six hundred sixty-five".