165181468551 has 32 divisors (see below), whose sum is σ = 243925026048. Its totient is φ = 98585456640.

The previous prime is 165181468523. The next prime is 165181468559. The reversal of 165181468551 is 155864181561.

It is not a de Polignac number, because 165181468551 - 2²² = 165177274247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165181468494 and 165181468503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165181468559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8650951 + ... + 8670023.

It is an arithmetic number, because the mean of its divisors is an integer number (7622657064).

Almost surely, 2^165181468551 is an apocalyptic number.

165181468551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165181468551 is a deficient number, since it is larger than the sum of its proper divisors (78743557497).

165181468551 is a wasteful number, since it uses less digits than its factorization.

165181468551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23071.

The product of its digits is 1152000, while the sum is 51.

The spelling of 165181468551 in words is "one hundred sixty-five billion, one hundred eighty-one million, four hundred sixty-eight thousand, five hundred fifty-one".