165672075779 has 24 divisors (see below), whose sum is σ = 199034697600. Its totient is φ = 137356611840.

The previous prime is 165672075773. The next prime is 165672075781. The reversal of 165672075779 is 977570276561.

It is a happy number.

It is not a de Polignac number, because 165672075779 - 2⁸ = 165672075523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165672075773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3208337 + ... + 3259565.

It is an arithmetic number, because the mean of its divisors is an integer number (8293112400).

Almost surely, 2^165672075779 is an apocalyptic number.

165672075779 is a deficient number, since it is larger than the sum of its proper divisors (33362621821).

165672075779 is a wasteful number, since it uses less digits than its factorization.

165672075779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53403 (or 53396 counting only the distinct ones).

The product of its (nonzero) digits is 38896200, while the sum is 62.

The spelling of 165672075779 in words is "one hundred sixty-five billion, six hundred seventy-two million, seventy-five thousand, seven hundred seventy-nine".