621222212611665 has 96 divisors (see below), whose sum is σ = 1263882346272000. Its totient is φ = 276309570580992.

The previous prime is 621222212611639. The next prime is 621222212611681. The reversal of 621222212611665 is 566116212222126.

621222212611665 is a `hidden beast` number, since 6 + 2 + 1 + 2 + 2 + 2 + 21 + 2 + 611 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 621222212611665 - 2²¹ = 621222210514513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 621222212611665.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2630986542 + ... + 2631222648.

It is an arithmetic number, because the mean of its divisors is an integer number (13165441107000).

Almost surely, 2^{621222212611665} is an apocalyptic number.

It is an amenable number.

621222212611665 is an abundant number, since it is smaller than the sum of its proper divisors (642660133660335).

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

621222212611665 is a wasteful number, since it uses less digits than its factorization.

621222212611665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461911 (or 461908 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 621222212611665 in words is "six hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, six hundred eleven thousand, six hundred sixty-five".