1646085664 has 24 divisors (see below), whose sum is σ = 3241654668. Its totient is φ = 822808320.

The previous prime is 1646085641. The next prime is 1646085697. The reversal of 1646085664 is 4665806461.

It can be written as a sum of positive squares in 2 ways, for example, as 1136229264 + 509856400 = 33708^2 + 22580^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181854 + ... + 190690.

Almost surely, 2^1646085664 is an apocalyptic number.

It is an amenable number.

1646085664 is a deficient number, since it is larger than the sum of its proper divisors (1595569004).

1646085664 is an equidigital number, since it uses as much as digits as its factorization.

1646085664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14668 (or 14660 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 1646085664 is about 40571.9812678651. The cubic root of 1646085664 is about 1180.7305788928.

The spelling of 1646085664 in words is "one billion, six hundred forty-six million, eighty-five thousand, six hundred sixty-four".