646625331 has 36 divisors (see below), whose sum is σ = 1036985040. Its totient is φ = 387948000.

The previous prime is 646625327. The next prime is 646625363. The reversal of 646625331 is 133526646.

646625331 is a `hidden beast` number, since 64 + 6 + 62 + 533 + 1 = 666.

It is not a de Polignac number, because 646625331 - 2² = 646625327 is a prime.

It is a super-2 number, since 2×646625331² = 836248637381719122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646625321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 107050 + ... + 112928.

It is an arithmetic number, because the mean of its divisors is an integer number (28805140).

Almost surely, 2^646625331 is an apocalyptic number.

646625331 is a deficient number, since it is larger than the sum of its proper divisors (390359709).

646625331 is a wasteful number, since it uses less digits than its factorization.

646625331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008 (or 5994 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 646625331 is about 25428.8287382648. The cubic root of 646625331 is about 864.7373905163.

The spelling of 646625331 in words is "six hundred forty-six million, six hundred twenty-five thousand, three hundred thirty-one".