621684043265 has 16 divisors (see below), whose sum is σ = 748938960000. Its totient is φ = 495402243072.

The previous prime is 621684043237. The next prime is 621684043291. The reversal of 621684043265 is 562340486126.

It is a cyclic number.

It is not a de Polignac number, because 621684043265 - 2²⁴ = 621667266049 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15719486 + ... + 15758984.

It is an arithmetic number, because the mean of its divisors is an integer number (46808685000).

Almost surely, 2^621684043265 is an apocalyptic number.

It is an amenable number.

621684043265 is a deficient number, since it is larger than the sum of its proper divisors (127254916735).

621684043265 is a wasteful number, since it uses less digits than its factorization.

621684043265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51736.

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 621684043265 in words is "six hundred twenty-one billion, six hundred eighty-four million, forty-three thousand, two hundred sixty-five".