644362630612627 has 2 divisors, whose sum is σ = 644362630612628. Its totient is φ = 644362630612626.

The previous prime is 644362630612541. The next prime is 644362630612643. The reversal of 644362630612627 is 726216036263446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644362630612627 - 2²⁷ = 644362496394899 is a prime.

It is a super-2 number, since 2×644362630612627² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (644362630619627) 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, 322181315306313 + 322181315306314.

It is an arithmetic number, because the mean of its divisors is an integer number (322181315306314).

Almost surely, 2^{644362630612627} is an apocalyptic number.

644362630612627 is a deficient number, since it is larger than the sum of its proper divisors (1).

644362630612627 is an equidigital number, since it uses as much as digits as its factorization.

644362630612627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62705664, while the sum is 58.

The spelling of 644362630612627 in words is "six hundred forty-four trillion, three hundred sixty-two billion, six hundred thirty million, six hundred twelve thousand, six hundred twenty-seven".