165260244581 has 4 divisors (see below), whose sum is σ = 165286858464. Its totient is φ = 165233630700.

The previous prime is 165260244497. The next prime is 165260244631. The reversal of 165260244581 is 185442062561.

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 165260244581 - 2¹⁰ = 165260243557 is a prime.

It is a super-2 number, since 2×165260244581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165260241581) 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, 13297625 + ... + 13310046.

It is an arithmetic number, because the mean of its divisors is an integer number (41321714616).

Almost surely, 2^165260244581 is an apocalyptic number.

It is an amenable number.

165260244581 is a deficient number, since it is larger than the sum of its proper divisors (26613883).

165260244581 is an equidigital number, since it uses as much as digits as its factorization.

165260244581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26613882.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 165260244581 in words is "one hundred sixty-five billion, two hundred sixty million, two hundred forty-four thousand, five hundred eighty-one".