646674665 has 32 divisors (see below), whose sum is σ = 957470976. Its totient is φ = 408303360.

The previous prime is 646674659. The next prime is 646674727. The reversal of 646674665 is 566476646.

It is not a de Polignac number, because 646674665 - 2¹⁰ = 646673641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208214 + ... + 211296.

It is an arithmetic number, because the mean of its divisors is an integer number (29920968).

Almost surely, 2^646674665 is an apocalyptic number.

646674665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

646674665 is a deficient number, since it is larger than the sum of its proper divisors (310796311).

646674665 is a wasteful number, since it uses less digits than its factorization.

646674665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569.

The product of its digits is 4354560, while the sum is 50.

The square root of 646674665 is about 25429.7987605093. The cubic root of 646674665 is about 864.7593815455.

The spelling of 646674665 in words is "six hundred forty-six million, six hundred seventy-four thousand, six hundred sixty-five".