634871958191 has 16 divisors (see below), whose sum is σ = 697790246400. Its totient is φ = 574937671968.

The previous prime is 634871958131. The next prime is 634871958299. The reversal of 634871958191 is 191859178436.

634871958191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 634871958191 - 2¹⁴ = 634871941807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634871958131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215345 + ... + 1147221.

It is an arithmetic number, because the mean of its divisors is an integer number (43611890400).

Almost surely, 2^634871958191 is an apocalyptic number.

634871958191 is a deficient number, since it is larger than the sum of its proper divisors (62918288209).

634871958191 is a wasteful number, since it uses less digits than its factorization.

634871958191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933478.

The product of its digits is 13063680, while the sum is 62.

The spelling of 634871958191 in words is "six hundred thirty-four billion, eight hundred seventy-one million, nine hundred fifty-eight thousand, one hundred ninety-one".