646370665 has 8 divisors (see below), whose sum is σ = 788791680. Its totient is φ = 508331952.

The previous prime is 646370657. The next prime is 646370707. The reversal of 646370665 is 566073646.

646370665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646370665 - 2³ = 646370657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095249 + ... + 1095838.

It is an arithmetic number, because the mean of its divisors is an integer number (98598960).

Almost surely, 2^646370665 is an apocalyptic number.

It is an amenable number.

646370665 is a deficient number, since it is larger than the sum of its proper divisors (142421015).

646370665 is a wasteful number, since it uses less digits than its factorization.

646370665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191151.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 646370665 is about 25423.8208182799. The cubic root of 646370665 is about 864.6238532955.

The spelling of 646370665 in words is "six hundred forty-six million, three hundred seventy thousand, six hundred sixty-five".