621955137283 has 2 divisors, whose sum is σ = 621955137284. Its totient is φ = 621955137282.

The previous prime is 621955137203. The next prime is 621955137289. The reversal of 621955137283 is 382731559126.

621955137283 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621955137283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621955137283.

It is not a weakly prime, because it can be changed into another prime (621955137289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310977568641 + 310977568642.

It is an arithmetic number, because the mean of its divisors is an integer number (310977568642).

Almost surely, 2^621955137283 is an apocalyptic number.

621955137283 is a deficient number, since it is larger than the sum of its proper divisors (1).

621955137283 is an equidigital number, since it uses as much as digits as its factorization.

621955137283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 52.

The spelling of 621955137283 in words is "six hundred twenty-one billion, nine hundred fifty-five million, one hundred thirty-seven thousand, two hundred eighty-three".