1646565816 has 48 divisors (see below), whose sum is σ = 4788485640. Its totient is φ = 470447040.

The previous prime is 1646565779. The next prime is 1646565829. The reversal of 1646565816 is 6185656461.

It is a super-2 number, since 2×1646565816² = 5422357972839491712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 698895 + ... + 701246.

Almost surely, 2^1646565816 is an apocalyptic number.

It is an amenable number.

1646565816 is an abundant number, since it is smaller than the sum of its proper divisors (3141919824).

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

1646565816 is a wasteful number, since it uses less digits than its factorization.

1646565816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400164 (or 1400153 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The square root of 1646565816 is about 40577.8981220073. The cubic root of 1646565816 is about 1180.8453714270.

The spelling of 1646565816 in words is "one billion, six hundred forty-six million, five hundred sixty-five thousand, eight hundred sixteen".