646364365 has 4 divisors (see below), whose sum is σ = 775637244. Its totient is φ = 517091488.

The previous prime is 646364321. The next prime is 646364371. The reversal of 646364365 is 563463646.

It is a happy number.

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 415385161 + 230979204 = 20381^2 + 15198^2 .

It is a cyclic number.

It is not a de Polignac number, because 646364365 - 2⁷ = 646364237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64636432 + ... + 64636441.

It is an arithmetic number, because the mean of its divisors is an integer number (193909311).

Almost surely, 2^646364365 is an apocalyptic number.

It is an amenable number.

646364365 is a deficient number, since it is larger than the sum of its proper divisors (129272879).

646364365 is a wasteful number, since it uses less digits than its factorization.

646364365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129272878.

The product of its digits is 933120, while the sum is 43.

The square root of 646364365 is about 25423.6969184263. The cubic root of 646364365 is about 864.6210442015.

The spelling of 646364365 in words is "six hundred forty-six million, three hundred sixty-four thousand, three hundred sixty-five".