165045636660431 has 4 divisors (see below), whose sum is σ = 165772709949912. Its totient is φ = 164318563370952.

The previous prime is 165045636660329. The next prime is 165045636660491. The reversal of 165045636660431 is 134066636540561.

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

It is a cyclic number.

It is not a de Polignac number, because 165045636660431 - 2³⁸ = 164770758753487 is a prime.

It is a super-2 number, since 2×165045636660431² (a number of 29 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 (165045636660491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363536644400 + ... + 363536644853.

It is an arithmetic number, because the mean of its divisors is an integer number (41443177487478).

Almost surely, 2^{165045636660431} is an apocalyptic number.

165045636660431 is a deficient number, since it is larger than the sum of its proper divisors (727073289481).

165045636660431 is an equidigital number, since it uses as much as digits as its factorization.

165045636660431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727073289480.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 165045636660431 in words is "one hundred sixty-five trillion, forty-five billion, six hundred thirty-six million, six hundred sixty thousand, four hundred thirty-one".