655624642565 has 32 divisors (see below), whose sum is σ = 879357409920. Its totient is φ = 466340143104.

The previous prime is 655624642559. The next prime is 655624642627. The reversal of 655624642565 is 565246426556.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655624642565 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655624642565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4919 + ... + 1145108.

It is an arithmetic number, because the mean of its divisors is an integer number (27479919060).

Almost surely, 2^655624642565 is an apocalyptic number.

It is an amenable number.

655624642565 is a deficient number, since it is larger than the sum of its proper divisors (223732767355).

655624642565 is a wasteful number, since it uses less digits than its factorization.

655624642565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150421.

The product of its digits is 51840000, while the sum is 56.

The spelling of 655624642565 in words is "six hundred fifty-five billion, six hundred twenty-four million, six hundred forty-two thousand, five hundred sixty-five".