65131981692 has 24 divisors (see below), whose sum is σ = 151981823952. Its totient is φ = 21709632000.

The previous prime is 65131981657. The next prime is 65131981699. The reversal of 65131981692 is 29618913156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65131981699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161442 + ... + 395382.

It is an arithmetic number, because the mean of its divisors is an integer number (6332575998).

Almost surely, 2^65131981692 is an apocalyptic number.

It is an amenable number.

65131981692 is an abundant number, since it is smaller than the sum of its proper divisors (86849842260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65131981692 is a wasteful number, since it uses less digits than its factorization.

65131981692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257149 (or 257147 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The spelling of 65131981692 in words is "sixty-five billion, one hundred thirty-one million, nine hundred eighty-one thousand, six hundred ninety-two".