638053853887 has 2 divisors, whose sum is σ = 638053853888. Its totient is φ = 638053853886.

The previous prime is 638053853881. The next prime is 638053853891. The reversal of 638053853887 is 788358350836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638053853887 is a prime.

It is a super-2 number, since 2×638053853887² (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 (638053853881) 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, 319026926943 + 319026926944.

It is an arithmetic number, because the mean of its divisors is an integer number (319026926944).

Almost surely, 2^638053853887 is an apocalyptic number.

638053853887 is a deficient number, since it is larger than the sum of its proper divisors (1).

638053853887 is an equidigital number, since it uses as much as digits as its factorization.

638053853887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116121600, while the sum is 64.

The spelling of 638053853887 in words is "six hundred thirty-eight billion, fifty-three million, eight hundred fifty-three thousand, eight hundred eighty-seven".