621955137311 has 2 divisors, whose sum is σ = 621955137312. Its totient is φ = 621955137310.

The previous prime is 621955137289. The next prime is 621955137319. The reversal of 621955137311 is 113731559126.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621955137311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621955137319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310977568655 + 310977568656.

It is an arithmetic number, because the mean of its divisors is an integer number (310977568656).

Almost surely, 2^621955137311 is an apocalyptic number.

621955137311 is a deficient number, since it is larger than the sum of its proper divisors (1).

621955137311 is an equidigital number, since it uses as much as digits as its factorization.

621955137311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The spelling of 621955137311 in words is "six hundred twenty-one billion, nine hundred fifty-five million, one hundred thirty-seven thousand, three hundred eleven".