165090253969 has 3 divisors (see below), whose sum is σ = 165090660283. Its totient is φ = 165089847656.

The previous prime is 165090253961. The next prime is 165090253997. The reversal of 165090253969 is 969352090561.

It is a happy number.

The square root of 165090253969 is 406313.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 154083726225 + 11006527744 = 392535^2 + 104912^2 .

It is not a de Polignac number, because 165090253969 - 2³ = 165090253961 is a prime.

It is a super-2 number, since 2×165090253969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165090253961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 203157 + ... + 609469.

Almost surely, 2^165090253969 is an apocalyptic number.

165090253969 is the 406313-rd square number.

165090253969 is the 203157-th centered octagonal number.

It is an amenable number.

165090253969 is a deficient number, since it is larger than the sum of its proper divisors (406314).

165090253969 is an frugal number, since it uses more digits than its factorization.

165090253969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812626 (or 406313 counting only the distinct ones).

The product of its (nonzero) digits is 3936600, while the sum is 55.

The spelling of 165090253969 in words is "one hundred sixty-five billion, ninety million, two hundred fifty-three thousand, nine hundred sixty-nine".