1666827656 has 32 divisors (see below), whose sum is σ = 3374443800. Its totient is φ = 767308800.

The previous prime is 1666827647. The next prime is 1666827677. The reversal of 1666827656 is 6567286661.

It can be written as a sum of positive squares in 4 ways, for example, as 1236928900 + 429898756 = 35170^2 + 20734^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1666827598 and 1666827607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19856 + ... + 61056.

Almost surely, 2^1666827656 is an apocalyptic number.

It is an amenable number.

1666827656 is an abundant number, since it is smaller than the sum of its proper divisors (1707616144).

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

1666827656 is a wasteful number, since it uses less digits than its factorization.

1666827656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41609 (or 41605 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The square root of 1666827656 is about 40826.8007073785. The cubic root of 1666827656 is about 1185.6692750597.

The spelling of 1666827656 in words is "one billion, six hundred sixty-six million, eight hundred twenty-seven thousand, six hundred fifty-six".