165576221275 has 24 divisors (see below), whose sum is σ = 209764234944. Its totient is φ = 129592377600.

The previous prime is 165576221267. The next prime is 165576221399. The reversal of 165576221275 is 572122675561.

It is not a de Polignac number, because 165576221275 - 2³ = 165576221267 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3161805 + ... + 3213745.

It is an arithmetic number, because the mean of its divisors is an integer number (8740176456).

Almost surely, 2^165576221275 is an apocalyptic number.

165576221275 is a deficient number, since it is larger than the sum of its proper divisors (44188013669).

165576221275 is a wasteful number, since it uses less digits than its factorization.

165576221275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54711 (or 54706 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 49.

The spelling of 165576221275 in words is "one hundred sixty-five billion, five hundred seventy-six million, two hundred twenty-one thousand, two hundred seventy-five".