644980676841 has 12 divisors (see below), whose sum is σ = 932434363120. Its totient is φ = 429619914360.

The previous prime is 644980676839. The next prime is 644980676863. The reversal of 644980676841 is 148676089446.

644980676841 is a `hidden beast` number, since 6 + 4 + 498 + 0 + 67 + 6 + 84 + 1 = 666.

It is not a de Polignac number, because 644980676841 - 2¹ = 644980676839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644980676891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30589171 + ... + 30610248.

Almost surely, 2^644980676841 is an apocalyptic number.

It is an amenable number.

644980676841 is a deficient number, since it is larger than the sum of its proper divisors (287453686279).

644980676841 is a wasteful number, since it uses less digits than its factorization.

644980676841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61200596 (or 61200593 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 644980676841 in words is "six hundred forty-four billion, nine hundred eighty million, six hundred seventy-six thousand, eight hundred forty-one".