656205421656 has 16 divisors (see below), whose sum is σ = 1640513554200. Its totient is φ = 218735140544.

The previous prime is 656205421649. The next prime is 656205421681. The reversal of 656205421656 is 656124502656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13670946261 + ... + 13670946308.

Almost surely, 2^656205421656 is an apocalyptic number.

It is an amenable number.

656205421656 is an abundant number, since it is smaller than the sum of its proper divisors (984308132544).

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

656205421656 is a wasteful number, since it uses less digits than its factorization.

656205421656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27341892578 (or 27341892574 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 656205421656 in words is "six hundred fifty-six billion, two hundred five million, four hundred twenty-one thousand, six hundred fifty-six".