39645656442 has 64 divisors (see below), whose sum is σ = 100717900800. Its totient is φ = 11323897200.

The previous prime is 39645656431. The next prime is 39645656459. The reversal of 39645656442 is 24465654693.

39645656442 is a `hidden beast` number, since 3 + 96 + 456 + 5 + 64 + 42 = 666.

39645656442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1399317 + ... + 1427367.

It is an arithmetic number, because the mean of its divisors is an integer number (1573717200).

Almost surely, 2^39645656442 is an apocalyptic number.

39645656442 is an abundant number, since it is smaller than the sum of its proper divisors (61072244358).

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

39645656442 is a wasteful number, since it uses less digits than its factorization.

39645656442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31808 (or 31802 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 39645656442 in words is "thirty-nine billion, six hundred forty-five million, six hundred fifty-six thousand, four hundred forty-two".