631644361643 has 2 divisors, whose sum is σ = 631644361644. Its totient is φ = 631644361642.

The previous prime is 631644361603. The next prime is 631644361657. The reversal of 631644361643 is 346163446136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631644361643 - 2³⁴ = 614464492459 is a prime.

It is not a weakly prime, because it can be changed into another prime (631644361603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315822180821 + 315822180822.

It is an arithmetic number, because the mean of its divisors is an integer number (315822180822).

Almost surely, 2^631644361643 is an apocalyptic number.

631644361643 is a deficient number, since it is larger than the sum of its proper divisors (1).

631644361643 is an equidigital number, since it uses as much as digits as its factorization.

631644361643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 47.

The spelling of 631644361643 in words is "six hundred thirty-one billion, six hundred forty-four million, three hundred sixty-one thousand, six hundred forty-three".