632638256891 has 2 divisors, whose sum is σ = 632638256892. Its totient is φ = 632638256890.

The previous prime is 632638256863. The next prime is 632638256909. The reversal of 632638256891 is 198652836236.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 632638256891 - 2⁶ = 632638256827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 632638256891.

It is not a weakly prime, because it can be changed into another prime (632638256291) 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, 316319128445 + 316319128446.

It is an arithmetic number, because the mean of its divisors is an integer number (316319128446).

Almost surely, 2^632638256891 is an apocalyptic number.

632638256891 is a deficient number, since it is larger than the sum of its proper divisors (1).

632638256891 is an equidigital number, since it uses as much as digits as its factorization.

632638256891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 59.

The spelling of 632638256891 in words is "six hundred thirty-two billion, six hundred thirty-eight million, two hundred fifty-six thousand, eight hundred ninety-one".