39616688645 has 16 divisors (see below), whose sum is σ = 48617781552. Its totient is φ = 30982533120.

The previous prime is 39616688627. The next prime is 39616688651. The reversal of 39616688645 is 54688661693.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 13300609 + 39603388036 = 3647^2 + 199006^2 .

It is not a de Polignac number, because 39616688645 - 2²⁰ = 39615640069 is a prime.

It is a Duffinian number.

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, 439016 + ... + 521505.

It is an arithmetic number, because the mean of its divisors is an integer number (3038611347).

Almost surely, 2^39616688645 is an apocalyptic number.

It is an amenable number.

39616688645 is a deficient number, since it is larger than the sum of its proper divisors (9001092907).

39616688645 is a wasteful number, since it uses less digits than its factorization.

39616688645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960712.

The product of its digits is 44789760, while the sum is 62.

The spelling of 39616688645 in words is "thirty-nine billion, six hundred sixteen million, six hundred eighty-eight thousand, six hundred forty-five".