641859877560 has 128 divisors (see below), whose sum is σ = 2100842645760. Its totient is φ = 155586816000.

The previous prime is 641859877517. The next prime is 641859877567. The reversal of 641859877560 is 65778958146.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 641859877491 and 641859877500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641859877567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18506235 + ... + 18540885.

It is an arithmetic number, because the mean of its divisors is an integer number (16412833170).

Almost surely, 2^641859877560 is an apocalyptic number.

641859877560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641859877560 is an abundant number, since it is smaller than the sum of its proper divisors (1458982768200).

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

641859877560 is a wasteful number, since it uses less digits than its factorization.

641859877560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48709 (or 48705 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 66.

The spelling of 641859877560 in words is "six hundred forty-one billion, eight hundred fifty-nine million, eight hundred seventy-seven thousand, five hundred sixty".