1231165660165 has 8 divisors (see below), whose sum is σ = 1688455762560. Its totient is φ = 844227881232.

The previous prime is 1231165660159. The next prime is 1231165660169. The reversal of 1231165660165 is 5610665611321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231165660165 - 2³³ = 1222575725573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231165660169) 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, 17588080825 + ... + 17588080894.

It is an arithmetic number, because the mean of its divisors is an integer number (211056970320).

Almost surely, 2^{1231165660165} is an apocalyptic number.

It is an amenable number.

1231165660165 is a deficient number, since it is larger than the sum of its proper divisors (457290102395).

1231165660165 is an equidigital number, since it uses as much as digits as its factorization.

1231165660165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35176161731.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 1231165660165 in words is "one trillion, two hundred thirty-one billion, one hundred sixty-five million, six hundred sixty thousand, one hundred sixty-five".