655668056 has 8 divisors (see below), whose sum is σ = 1229377620. Its totient is φ = 327834024.

The previous prime is 655668049. The next prime is 655668071. The reversal of 655668056 is 650866556.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 655668056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40979246 + ... + 40979261.

Almost surely, 2^655668056 is an apocalyptic number.

It is an amenable number.

655668056 is a deficient number, since it is larger than the sum of its proper divisors (573709564).

655668056 is a wasteful number, since it uses less digits than its factorization.

655668056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81958513 (or 81958509 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The square root of 655668056 is about 25606.0160118672. The cubic root of 655668056 is about 868.7497150526.

The spelling of 655668056 in words is "six hundred fifty-five million, six hundred sixty-eight thousand, fifty-six".