155663456181 has 16 divisors (see below), whose sum is σ = 219771566784. Its totient is φ = 97666124544.

The previous prime is 155663456171. The next prime is 155663456197. The reversal of 155663456181 is 181654366551.

It is not a de Polignac number, because 155663456181 - 2⁵ = 155663456149 is a prime.

It is a super-2 number, since 2×155663456181² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155663456111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078755 + ... + 1214511.

It is an arithmetic number, because the mean of its divisors is an integer number (13735722924).

Almost surely, 2^155663456181 is an apocalyptic number.

It is an amenable number.

155663456181 is a deficient number, since it is larger than the sum of its proper divisors (64108110603).

155663456181 is a wasteful number, since it uses less digits than its factorization.

155663456181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158260.

The product of its digits is 2592000, while the sum is 51.

The spelling of 155663456181 in words is "one hundred fifty-five billion, six hundred sixty-three million, four hundred fifty-six thousand, one hundred eighty-one".