646256464663 has 4 divisors (see below), whose sum is σ = 646265703600. Its totient is φ = 646247225728.

The previous prime is 646256464631. The next prime is 646256464699. The reversal of 646256464663 is 366464652646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 646256464663 - 2⁵ = 646256464631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646256464598 and 646256464607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646256464163) 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, 4513738 + ... + 4654711.

It is an arithmetic number, because the mean of its divisors is an integer number (161566425900).

Almost surely, 2^646256464663 is an apocalyptic number.

646256464663 is a deficient number, since it is larger than the sum of its proper divisors (9238937).

646256464663 is an equidigital number, since it uses as much as digits as its factorization.

646256464663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9238936.

The product of its digits is 89579520, while the sum is 58.

The spelling of 646256464663 in words is "six hundred forty-six billion, two hundred fifty-six million, four hundred sixty-four thousand, six hundred sixty-three".