56665211655 has 64 divisors (see below), whose sum is σ = 98476116480. Its totient is φ = 27658215936.

The previous prime is 56665211639. The next prime is 56665211657. The reversal of 56665211655 is 55611256665.

It is not a de Polignac number, because 56665211655 - 2⁴ = 56665211639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56665211657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16009876 + ... + 16013414.

It is an arithmetic number, because the mean of its divisors is an integer number (1538689320).

Almost surely, 2^56665211655 is an apocalyptic number.

56665211655 is a deficient number, since it is larger than the sum of its proper divisors (41810904825).

56665211655 is a wasteful number, since it uses less digits than its factorization.

56665211655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240.

The product of its digits is 1620000, while the sum is 48.

The spelling of 56665211655 in words is "fifty-six billion, six hundred sixty-five million, two hundred eleven thousand, six hundred fifty-five".