621684827629 has 2 divisors, whose sum is σ = 621684827630. Its totient is φ = 621684827628.

The previous prime is 621684827549. The next prime is 621684827651. The reversal of 621684827629 is 926728486126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620132625225 + 1552202404 = 787485^2 + 39398^2 .

It is a cyclic number.

It is not a de Polignac number, because 621684827629 - 2³⁵ = 587325089261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621684827129) 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, 310842413814 + 310842413815.

It is an arithmetic number, because the mean of its divisors is an integer number (310842413815).

Almost surely, 2^621684827629 is an apocalyptic number.

It is an amenable number.

621684827629 is a deficient number, since it is larger than the sum of its proper divisors (1).

621684827629 is an equidigital number, since it uses as much as digits as its factorization.

621684827629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 61.

The spelling of 621684827629 in words is "six hundred twenty-one billion, six hundred eighty-four million, eight hundred twenty-seven thousand, six hundred twenty-nine".