165672810653 has 4 divisors (see below), whose sum is σ = 189340355040. Its totient is φ = 142005266268.

The previous prime is 165672810637. The next prime is 165672810659. The reversal of 165672810653 is 356018276561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165672810653 - 2⁴ = 165672810637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165672810659) 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, 11833772183 + ... + 11833772196.

It is an arithmetic number, because the mean of its divisors is an integer number (47335088760).

Almost surely, 2^165672810653 is an apocalyptic number.

It is an amenable number.

165672810653 is a deficient number, since it is larger than the sum of its proper divisors (23667544387).

165672810653 is an equidigital number, since it uses as much as digits as its factorization.

165672810653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23667544386.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 165672810653 in words is "one hundred sixty-five billion, six hundred seventy-two million, eight hundred ten thousand, six hundred fifty-three".