165426831361 has 4 divisors (see below), whose sum is σ = 180465634224. Its totient is φ = 150388028500.

The previous prime is 165426831337. The next prime is 165426831421. The reversal of 165426831361 is 163138624561.

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 165426831361 - 2⁵ = 165426831329 is a prime.

It is a super-2 number, since 2×165426831361² (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 (165426831301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7519401415 + ... + 7519401436.

It is an arithmetic number, because the mean of its divisors is an integer number (45116408556).

Almost surely, 2^165426831361 is an apocalyptic number.

165426831361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165426831361 is a deficient number, since it is larger than the sum of its proper divisors (15038802863).

165426831361 is a wasteful number, since it uses less digits than its factorization.

165426831361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15038802862.

The product of its digits is 622080, while the sum is 46.

The spelling of 165426831361 in words is "one hundred sixty-five billion, four hundred twenty-six million, eight hundred thirty-one thousand, three hundred sixty-one".