656201668 has 6 divisors (see below), whose sum is σ = 1148352926. Its totient is φ = 328100832.

The previous prime is 656201657. The next prime is 656201671. The reversal of 656201668 is 866102656.

It can be written as a sum of positive squares in only one way, i.e., 615139204 + 41062464 = 24802^2 + 6408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 656201668.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82025205 + ... + 82025212.

Almost surely, 2^656201668 is an apocalyptic number.

It is an amenable number.

656201668 is a deficient number, since it is larger than the sum of its proper divisors (492151258).

656201668 is a wasteful number, since it uses less digits than its factorization.

656201668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164050421 (or 164050419 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 656201668 is about 25616.4335534828. The cubic root of 656201668 is about 868.9853269430.

The spelling of 656201668 in words is "six hundred fifty-six million, two hundred one thousand, six hundred sixty-eight".