1664907056 has 20 divisors (see below), whose sum is σ = 3312941232. Its totient is φ = 809954496.

The previous prime is 1664907031. The next prime is 1664907059. The reversal of 1664907056 is 6507094661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1664906998 and 1664907016.

It is not an unprimeable number, because it can be changed into a prime (1664907059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405580 + ... + 1406763.

Almost surely, 2^1664907056 is an apocalyptic number.

1664907056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1664907056 is a deficient number, since it is larger than the sum of its proper divisors (1648034176).

1664907056 is a wasteful number, since it uses less digits than its factorization.

1664907056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812388 (or 2812382 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1664907056 is about 40803.2726138480. The cubic root of 1664907056 is about 1185.2137047445.

The spelling of 1664907056 in words is "one billion, six hundred sixty-four million, nine hundred seven thousand, fifty-six".