656394493656 has 32 divisors (see below), whose sum is σ = 1790166801600. Its totient is φ = 198907422240.

The previous prime is 656394493649. The next prime is 656394493679.

656394493656 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1243171126 + ... + 1243171653.

It is an arithmetic number, because the mean of its divisors is an integer number (55942712550).

Almost surely, 2^656394493656 is an apocalyptic number.

656394493656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

656394493656 is an abundant number, since it is smaller than the sum of its proper divisors (1133772307944).

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

656394493656 is a wasteful number, since it uses less digits than its factorization.

656394493656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486342799 (or 2486342795 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 66.

The spelling of 656394493656 in words is "six hundred fifty-six billion, three hundred ninety-four million, four hundred ninety-three thousand, six hundred fifty-six".