634857859919 has 2 divisors, whose sum is σ = 634857859920. Its totient is φ = 634857859918.

The previous prime is 634857859913. The next prime is 634857859967. The reversal of 634857859919 is 919958758436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634857859919 - 2⁴ = 634857859903 is a prime.

It is a super-2 number, since 2×634857859919² (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 (634857859913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317428929959 + 317428929960.

It is an arithmetic number, because the mean of its divisors is an integer number (317428929960).

Almost surely, 2^634857859919 is an apocalyptic number.

634857859919 is a deficient number, since it is larger than the sum of its proper divisors (1).

634857859919 is an equidigital number, since it uses as much as digits as its factorization.

634857859919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 587865600, while the sum is 74.

The spelling of 634857859919 in words is "six hundred thirty-four billion, eight hundred fifty-seven million, eight hundred fifty-nine thousand, nine hundred nineteen".