646355313 has 12 divisors (see below), whose sum is σ = 934494288. Its totient is φ = 430502040.

The previous prime is 646355293. The next prime is 646355321. The reversal of 646355313 is 313553646.

646355313 is a `hidden beast` number, since 6 + 4 + 635 + 5 + 3 + 13 = 666.

It is not a de Polignac number, because 646355313 - 2²⁰ = 645306737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646355323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23095 + ... + 42732.

It is an arithmetic number, because the mean of its divisors is an integer number (77874524).

Almost surely, 2^646355313 is an apocalyptic number.

It is an amenable number.

646355313 is a deficient number, since it is larger than the sum of its proper divisors (288138975).

646355313 is a wasteful number, since it uses less digits than its factorization.

646355313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66924 (or 66921 counting only the distinct ones).

The product of its digits is 97200, while the sum is 36.

The square root of 646355313 is about 25423.5188949130. The cubic root of 646355313 is about 864.6170079919.

It can be divided in two parts, 6463 and 55313, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 646355313 in words is "six hundred forty-six million, three hundred fifty-five thousand, three hundred thirteen".