631688320567 has 2 divisors, whose sum is σ = 631688320568. Its totient is φ = 631688320566.

The previous prime is 631688320493. The next prime is 631688320573. The reversal of 631688320567 is 765023886136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631688320567 - 2¹⁹ = 631687796279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631688320597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315844160283 + 315844160284.

It is an arithmetic number, because the mean of its divisors is an integer number (315844160284).

Almost surely, 2^631688320567 is an apocalyptic number.

631688320567 is a deficient number, since it is larger than the sum of its proper divisors (1).

631688320567 is an equidigital number, since it uses as much as digits as its factorization.

631688320567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 631688320567 in words is "six hundred thirty-one billion, six hundred eighty-eight million, three hundred twenty thousand, five hundred sixty-seven".