231685993765 has 4 divisors (see below), whose sum is σ = 278023192524. Its totient is φ = 185348795008.

The previous prime is 231685993753. The next prime is 231685993783. The reversal of 231685993765 is 567399586132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183664530721 + 48021463044 = 428561^2 + 219138^2 .

It is a cyclic number.

It is not a de Polignac number, because 231685993765 - 2⁵ = 231685993733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231685993697 and 231685993706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23168599372 + ... + 23168599381.

It is an arithmetic number, because the mean of its divisors is an integer number (69505798131).

Almost surely, 2^231685993765 is an apocalyptic number.

It is an amenable number.

231685993765 is a deficient number, since it is larger than the sum of its proper divisors (46337198759).

231685993765 is an equidigital number, since it uses as much as digits as its factorization.

231685993765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46337198758.

The product of its digits is 73483200, while the sum is 64.

The spelling of 231685993765 in words is "two hundred thirty-one billion, six hundred eighty-five million, nine hundred ninety-three thousand, seven hundred sixty-five".