641656250624 has 18 divisors (see below), whose sum is σ = 1280806032030. Its totient is φ = 320828125184.

The previous prime is 641656250581. The next prime is 641656250633. The reversal of 641656250624 is 426052656146.

It can be written as a sum of positive squares in only one way, i.e., 461269172224 + 180387078400 = 679168^2 + 424720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1253234609 + ... + 1253235120.

Almost surely, 2^641656250624 is an apocalyptic number.

641656250624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

641656250624 is a deficient number, since it is larger than the sum of its proper divisors (639149781406).

641656250624 is an equidigital number, since it uses as much as digits as its factorization.

641656250624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506469745 (or 2506469731 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 641656250624 in words is "six hundred forty-one billion, six hundred fifty-six million, two hundred fifty thousand, six hundred twenty-four".