641257829772 has 24 divisors (see below), whose sum is σ = 1710020879616. Its totient is φ = 183216522768.

The previous prime is 641257829701. The next prime is 641257829777. The reversal of 641257829772 is 277928752146.

It is a super-2 number, since 2×641257829772² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641257829777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3817010808 + ... + 3817010975.

It is an arithmetic number, because the mean of its divisors is an integer number (71250869984).

Almost surely, 2^641257829772 is an apocalyptic number.

It is an amenable number.

641257829772 is an abundant number, since it is smaller than the sum of its proper divisors (1068763049844).

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

641257829772 is a wasteful number, since it uses less digits than its factorization.

641257829772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7634021797 (or 7634021795 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 60.

The spelling of 641257829772 in words is "six hundred forty-one billion, two hundred fifty-seven million, eight hundred twenty-nine thousand, seven hundred seventy-two".