165432231261 has 24 divisors (see below), whose sum is σ = 272015055936. Its totient is φ = 95902741440.

The previous prime is 165432231253. The next prime is 165432231269. The reversal of 165432231261 is 162132234561.

165432231261 is a `hidden beast` number, since 1 + 6 + 543 + 22 + 31 + 2 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (165432231253) and next prime (165432231269).

It is not a de Polignac number, because 165432231261 - 2³ = 165432231253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165432231269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36324520 + ... + 36329073.

It is an arithmetic number, because the mean of its divisors is an integer number (11333960664).

Almost surely, 2^165432231261 is an apocalyptic number.

165432231261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165432231261 is a deficient number, since it is larger than the sum of its proper divisors (106582824675).

165432231261 is a wasteful number, since it uses less digits than its factorization.

165432231261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72653633 (or 72653630 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

It can be divided in two parts, 165432 and 231261, that added together give a palindrome (396693).

The spelling of 165432231261 in words is "one hundred sixty-five billion, four hundred thirty-two million, two hundred thirty-one thousand, two hundred sixty-one".