56661870344478 has 96 divisors (see below), whose sum is σ = 137597866600704. Its totient is φ = 15234759272448.

The previous prime is 56661870344467. The next prime is 56661870344491. The reversal of 56661870344478 is 87444307816665.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91174425 + ... + 91793787.

It is an arithmetic number, because the mean of its divisors is an integer number (1433311110424).

Almost surely, 2^{56661870344478} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56661870344478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68798933300352).

56661870344478 is an abundant number, since it is smaller than the sum of its proper divisors (80935996256226).

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

56661870344478 is a wasteful number, since it uses less digits than its factorization.

56661870344478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626946 (or 626929 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 69.

The spelling of 56661870344478 in words is "fifty-six trillion, six hundred sixty-one billion, eight hundred seventy million, three hundred forty-four thousand, four hundred seventy-eight".