621684827651 has 2 divisors, whose sum is σ = 621684827652. Its totient is φ = 621684827650.

The previous prime is 621684827629. The next prime is 621684827671. The reversal of 621684827651 is 156728486126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621684827651 - 2²² = 621680633347 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (621684827671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310842413825 + 310842413826.

It is an arithmetic number, because the mean of its divisors is an integer number (310842413826).

Almost surely, 2^621684827651 is an apocalyptic number.

621684827651 is a deficient number, since it is larger than the sum of its proper divisors (1).

621684827651 is an equidigital number, since it uses as much as digits as its factorization.

621684827651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 56.

The spelling of 621684827651 in words is "six hundred twenty-one billion, six hundred eighty-four million, eight hundred twenty-seven thousand, six hundred fifty-one".