861137568431 has 16 divisors (see below), whose sum is σ = 998523144000. Its totient is φ = 727361399808.

The previous prime is 861137568391. The next prime is 861137568463. The reversal of 861137568431 is 134865731168.

It is a cyclic number.

It is not a de Polignac number, because 861137568431 - 2¹⁴ = 861137552047 is a prime.

It is a super-2 number, since 2×861137568431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861137568491) 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, 169406 + ... + 1323243.

It is an arithmetic number, because the mean of its divisors is an integer number (62407696500).

Almost surely, 2^861137568431 is an apocalyptic number.

861137568431 is a deficient number, since it is larger than the sum of its proper divisors (137385575569).

861137568431 is a wasteful number, since it uses less digits than its factorization.

861137568431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493858.

The product of its digits is 2903040, while the sum is 53.

The spelling of 861137568431 in words is "eight hundred sixty-one billion, one hundred thirty-seven million, five hundred sixty-eight thousand, four hundred thirty-one".