86640561432831 has 80 divisors (see below), whose sum is σ = 138262967377920. Its totient is φ = 48227955027840.

The previous prime is 86640561432827. The next prime is 86640561432833. The reversal of 86640561432831 is 13823416504668.

It is not a de Polignac number, because 86640561432831 - 2² = 86640561432827 is a prime.

It is a super-2 number, since 2×86640561432831² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86640561432833) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 194395266 + ... + 194840448.

It is an arithmetic number, because the mean of its divisors is an integer number (1728287092224).

Almost surely, 2^{86640561432831} is an apocalyptic number.

86640561432831 is a deficient number, since it is larger than the sum of its proper divisors (51622405945089).

86640561432831 is an equidigital number, since it uses as much as digits as its factorization.

86640561432831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445914 (or 445893 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 86640561432831 in words is "eighty-six trillion, six hundred forty billion, five hundred sixty-one million, four hundred thirty-two thousand, eight hundred thirty-one".