631387353540863 has 2 divisors, whose sum is σ = 631387353540864. Its totient is φ = 631387353540862.

The previous prime is 631387353540809. The next prime is 631387353540899. The reversal of 631387353540863 is 368045353783136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631387353540863 - 2⁶ = 631387353540799 is a prime.

It is a super-2 number, since 2×631387353540863² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631387353540863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631387353240863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315693676770431 + 315693676770432.

It is an arithmetic number, because the mean of its divisors is an integer number (315693676770432).

Almost surely, 2^{631387353540863} is an apocalyptic number.

631387353540863 is a deficient number, since it is larger than the sum of its proper divisors (1).

631387353540863 is an equidigital number, since it uses as much as digits as its factorization.

631387353540863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 391910400, while the sum is 65.

The spelling of 631387353540863 in words is "six hundred thirty-one trillion, three hundred eighty-seven billion, three hundred fifty-three million, five hundred forty thousand, eight hundred sixty-three".