621640266431027 has 2 divisors, whose sum is σ = 621640266431028. Its totient is φ = 621640266431026.

The previous prime is 621640266431011. The next prime is 621640266431111. The reversal of 621640266431027 is 720134662046126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621640266431027 - 2⁴ = 621640266431011 is a prime.

It is not a weakly prime, because it can be changed into another prime (621640266451027) 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, 310820133215513 + 310820133215514.

It is an arithmetic number, because the mean of its divisors is an integer number (310820133215514).

Almost surely, 2^{621640266431027} is an apocalyptic number.

621640266431027 is a deficient number, since it is larger than the sum of its proper divisors (1).

621640266431027 is an equidigital number, since it uses as much as digits as its factorization.

621640266431027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 50.

The spelling of 621640266431027 in words is "six hundred twenty-one trillion, six hundred forty billion, two hundred sixty-six million, four hundred thirty-one thousand, twenty-seven".