1646566644 has 48 divisors (see below), whose sum is σ = 3889424000. Its totient is φ = 542111616.

The previous prime is 1646566627. The next prime is 1646566681. The reversal of 1646566644 is 4466656461.

It is a super-2 number, since 2×1646566644² = 5422363426266845472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646566593 and 1646566602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454689 + ... + 458295.

Almost surely, 2^1646566644 is an apocalyptic number.

It is an amenable number.

1646566644 is an abundant number, since it is smaller than the sum of its proper divisors (2242857356).

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

1646566644 is a wasteful number, since it uses less digits than its factorization.

1646566644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4070 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 48.

The square root of 1646566644 is about 40577.9083246044. The cubic root of 1646566644 is about 1180.8455693621.

The spelling of 1646566644 in words is "one billion, six hundred forty-six million, five hundred sixty-six thousand, six hundred forty-four".