165412214561 has 4 divisors (see below), whose sum is σ = 180449688624. Its totient is φ = 150374740500.

The previous prime is 165412214533. The next prime is 165412214609.

165412214561 is nontrivially palindromic in base 10.

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 165412214561 - 2¹⁰ = 165412213537 is a prime.

It is a super-2 number, since 2×165412214561² (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 (165412214761) 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, 7518737015 + ... + 7518737036.

It is an arithmetic number, because the mean of its divisors is an integer number (45112422156).

Almost surely, 2^165412214561 is an apocalyptic number.

165412214561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165412214561 is a deficient number, since it is larger than the sum of its proper divisors (15037474063).

165412214561 is a wasteful number, since it uses less digits than its factorization.

165412214561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037474062.

The product of its digits is 57600, while the sum is 38.

It can be divided in two parts, 165412 and 214561, that added together give a palindrome (379973).

The spelling of 165412214561 in words is "one hundred sixty-five billion, four hundred twelve million, two hundred fourteen thousand, five hundred sixty-one".