646463008646 has 16 divisors (see below), whose sum is σ = 1193470170144. Its totient is φ = 255743607744.

The previous prime is 646463008537. The next prime is 646463008657. The reversal of 646463008646 is 646800364646.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 1775997095 + ... + 1775997458.

It is an arithmetic number, because the mean of its divisors is an integer number (74591885634).

Almost surely, 2^646463008646 is an apocalyptic number.

646463008646 is a deficient number, since it is larger than the sum of its proper divisors (547007161498).

646463008646 is a wasteful number, since it uses less digits than its factorization.

646463008646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551994575.

The product of its (nonzero) digits is 11943936, while the sum is 53.

The spelling of 646463008646 in words is "six hundred forty-six billion, four hundred sixty-three million, eight thousand, six hundred forty-six".