641562552637 has 2 divisors, whose sum is σ = 641562552638. Its totient is φ = 641562552636.

The previous prime is 641562552599. The next prime is 641562552731. The reversal of 641562552637 is 736255265146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 456788091321 + 184774461316 = 675861^2 + 429854^2 .

It is a cyclic number.

It is not a de Polignac number, because 641562552637 - 2²⁷ = 641428334909 is a prime.

It is a super-2 number, since 2×641562552637² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641562552737) 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, 320781276318 + 320781276319.

It is an arithmetic number, because the mean of its divisors is an integer number (320781276319).

Almost surely, 2^641562552637 is an apocalyptic number.

It is an amenable number.

641562552637 is a deficient number, since it is larger than the sum of its proper divisors (1).

641562552637 is an equidigital number, since it uses as much as digits as its factorization.

641562552637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072000, while the sum is 52.

The spelling of 641562552637 in words is "six hundred forty-one billion, five hundred sixty-two million, five hundred fifty-two thousand, six hundred thirty-seven".