56643834665 has 24 divisors (see below), whose sum is σ = 74814836544. Its totient is φ = 41139744800.

The previous prime is 56643834661. The next prime is 56643834671.

56643834665 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 56643834665 - 2² = 56643834661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 56643834665.

It is not an unprimeable number, because it can be changed into a prime (56643834661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386510 + ... + 512520.

It is an arithmetic number, because the mean of its divisors is an integer number (3117284856).

Almost surely, 2^56643834665 is an apocalyptic number.

56643834665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56643834665 is a deficient number, since it is larger than the sum of its proper divisors (18171001879).

56643834665 is a wasteful number, since it uses less digits than its factorization.

56643834665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126781 (or 126770 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 56.

The spelling of 56643834665 in words is "fifty-six billion, six hundred forty-three million, eight hundred thirty-four thousand, six hundred sixty-five".