646063043657 has 8 divisors (see below), whose sum is σ = 658116750600. Its totient is φ = 634056514560.

The previous prime is 646063043603. The next prime is 646063043677. The reversal of 646063043657 is 756340360646.

646063043657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 121765404601 + 524297639056 = 348949^2 + 724084^2 .

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 646063043657 - 2⁸ = 646063043401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646063043677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11766818 + ... + 11821595.

It is an arithmetic number, because the mean of its divisors is an integer number (82264593825).

Almost surely, 2^646063043657 is an apocalyptic number.

It is an amenable number.

646063043657 is a deficient number, since it is larger than the sum of its proper divisors (12053706943).

646063043657 is a wasteful number, since it uses less digits than its factorization.

646063043657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23588923.

The product of its (nonzero) digits is 6531840, while the sum is 50.

The spelling of 646063043657 in words is "six hundred forty-six billion, sixty-three million, forty-three thousand, six hundred fifty-seven".