641521431465615 has 192 divisors, whose sum is σ = 1227963987169920. Its totient is φ = 320179241041920.

The previous prime is 641521431465451. The next prime is 641521431465623. The reversal of 641521431465615 is 516564134125146.

641521431465615 is a `hidden beast` number, since 6 + 4 + 1 + 5 + 2 + 1 + 4 + 3 + 14 + 6 + 5 + 615 = 666.

It is not a de Polignac number, because 641521431465615 - 2¹⁰ = 641521431464591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25081952707 + ... + 25081978283.

It is an arithmetic number, because the mean of its divisors is an integer number (6395645766510).

Almost surely, 2^{641521431465615} is an apocalyptic number.

641521431465615 is a deficient number, since it is larger than the sum of its proper divisors (586442555704305).

641521431465615 is a wasteful number, since it uses less digits than its factorization.

641521431465615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32504 (or 32492 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 641521431465615 in words is "six hundred forty-one trillion, five hundred twenty-one billion, four hundred thirty-one million, four hundred sixty-five thousand, six hundred fifteen".