646990242336 has 120 divisors (see below), whose sum is σ = 1928846378844. Its totient is φ = 212709058560.

The previous prime is 646990242319. The next prime is 646990242383. The reversal of 646990242336 is 633242099646.

646990242336 is a `hidden beast` number, since 6 + 4 + 69 + 9 + 0 + 242 + 336 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 605838062736 + 41152179600 = 778356^2 + 202860^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1520445 + ... + 1898876.

Almost surely, 2^646990242336 is an apocalyptic number.

It is an amenable number.

646990242336 is an abundant number, since it is smaller than the sum of its proper divisors (1281856136508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646990242336 is a wasteful number, since it uses less digits than its factorization.

646990242336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419416 (or 3419399 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 54.

The spelling of 646990242336 in words is "six hundred forty-six billion, nine hundred ninety million, two hundred forty-two thousand, three hundred thirty-six".