621455642311 has 4 divisors (see below), whose sum is σ = 710235019792. Its totient is φ = 532676264832.

The previous prime is 621455642309. The next prime is 621455642329. The reversal of 621455642311 is 113246554126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621455642311 - 2¹ = 621455642309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621455642371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44389688730 + ... + 44389688743.

It is an arithmetic number, because the mean of its divisors is an integer number (177558754948).

Almost surely, 2^621455642311 is an apocalyptic number.

621455642311 is a deficient number, since it is larger than the sum of its proper divisors (88779377481).

621455642311 is an equidigital number, since it uses as much as digits as its factorization.

621455642311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88779377480.

The product of its digits is 172800, while the sum is 40.

The spelling of 621455642311 in words is "six hundred twenty-one billion, four hundred fifty-five million, six hundred forty-two thousand, three hundred eleven".