1630668656 has 20 divisors (see below), whose sum is σ = 3160261272. Its totient is φ = 815117376.

The previous prime is 1630668629. The next prime is 1630668701. The reversal of 1630668656 is 6568660361.

It is a self number, because there is not a number n which added to its sum of digits gives 1630668656.

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, 60806 + ... + 83418.

Almost surely, 2^1630668656 is an apocalyptic number.

1630668656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1630668656 is a deficient number, since it is larger than the sum of its proper divisors (1529592616).

1630668656 is a wasteful number, since it uses less digits than its factorization.

1630668656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27128 (or 27122 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 1630668656 is about 40381.5385541462. The cubic root of 1630668656 is about 1177.0328247407.

The spelling of 1630668656 in words is "one billion, six hundred thirty million, six hundred sixty-eight thousand, six hundred fifty-six".