641421523645265 has 16 divisors (see below), whose sum is σ = 852211609168320. Its totient is φ = 459525867683520.

The previous prime is 641421523645207. The next prime is 641421523645271. The reversal of 641421523645265 is 562546325124146.

It is not a de Polignac number, because 641421523645265 - 2⁸ = 641421523645009 is a prime.

It is a super-2 number, since 2×641421523645265² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641421523645265.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87031410650 + ... + 87031418019.

It is an arithmetic number, because the mean of its divisors is an integer number (53263225573020).

Almost surely, 2^{641421523645265} is an apocalyptic number.

It is an amenable number.

641421523645265 is a deficient number, since it is larger than the sum of its proper divisors (210790085523055).

641421523645265 is a wasteful number, since it uses less digits than its factorization.

641421523645265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174062828752.

The product of its digits is 41472000, while the sum is 56.

The spelling of 641421523645265 in words is "six hundred forty-one trillion, four hundred twenty-one billion, five hundred twenty-three million, six hundred forty-five thousand, two hundred sixty-five".