641657912172 has 24 divisors (see below), whose sum is σ = 1497506304000. Its totient is φ = 213842469456.

The previous prime is 641657912167. The next prime is 641657912179. The reversal of 641657912172 is 271219756146.

It is not an unprimeable number, because it can be changed into a prime (641657912179) 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, 5376172 + ... + 5494227.

It is an arithmetic number, because the mean of its divisors is an integer number (62396096000).

Almost surely, 2^641657912172 is an apocalyptic number.

It is an amenable number.

641657912172 is an abundant number, since it is smaller than the sum of its proper divisors (855848391828).

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

641657912172 is a wasteful number, since it uses less digits than its factorization.

641657912172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10875325 (or 10875323 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The spelling of 641657912172 in words is "six hundred forty-one billion, six hundred fifty-seven million, nine hundred twelve thousand, one hundred seventy-two".