642664313 has 4 divisors (see below), whose sum is σ = 649027428. Its totient is φ = 636301200.

The previous prime is 642664301. The next prime is 642664339. The reversal of 642664313 is 313466246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382906624 + 259757689 = 19568^2 + 16117^2 .

It is a cyclic number.

It is not a de Polignac number, because 642664313 - 2⁶ = 642664249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642664213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3181406 + ... + 3181607.

It is an arithmetic number, because the mean of its divisors is an integer number (162256857).

Almost surely, 2^642664313 is an apocalyptic number.

It is an amenable number.

642664313 is a deficient number, since it is larger than the sum of its proper divisors (6363115).

642664313 is a wasteful number, since it uses less digits than its factorization.

642664313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363114.

The product of its digits is 62208, while the sum is 35.

The square root of 642664313 is about 25350.8247005891. The cubic root of 642664313 is about 862.9680721409.

The spelling of 642664313 in words is "six hundred forty-two million, six hundred sixty-four thousand, three hundred thirteen".