634711512861 has 12 divisors (see below), whose sum is σ = 946379890560. Its totient is φ = 409491298440.

The previous prime is 634711512857. The next prime is 634711512871. The reversal of 634711512861 is 168215117436.

634711512861 is a `hidden beast` number, since 6 + 3 + 4 + 71 + 1 + 512 + 8 + 61 = 666.

634711512861 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 634711512861 - 2² = 634711512857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634711512811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1137475551 + ... + 1137476108.

It is an arithmetic number, because the mean of its divisors is an integer number (78864990880).

Almost surely, 2^634711512861 is an apocalyptic number.

It is an amenable number.

634711512861 is a deficient number, since it is larger than the sum of its proper divisors (311668377699).

634711512861 is a wasteful number, since it uses less digits than its factorization.

634711512861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274951696 (or 2274951693 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 634711512861 in words is "six hundred thirty-four billion, seven hundred eleven million, five hundred twelve thousand, eight hundred sixty-one".