161227541655 has 24 divisors (see below), whose sum is σ = 280044535680. Its totient is φ = 85808495040.

The previous prime is 161227541639. The next prime is 161227541681. The reversal of 161227541655 is 556145722161.

161227541655 is a `hidden beast` number, since 1 + 6 + 1 + 227 + 5 + 416 + 5 + 5 = 666.

It is not a de Polignac number, because 161227541655 - 2⁴ = 161227541639 is a prime.

It is a super-2 number, since 2×161227541655² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161227541655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3718356 + ... + 3761465.

It is an arithmetic number, because the mean of its divisors is an integer number (11668522320).

Almost surely, 2^161227541655 is an apocalyptic number.

161227541655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161227541655 is a deficient number, since it is larger than the sum of its proper divisors (118816994025).

161227541655 is a wasteful number, since it uses less digits than its factorization.

161227541655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7480311 (or 7480308 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 161227541655 in words is "one hundred sixty-one billion, two hundred twenty-seven million, five hundred forty-one thousand, six hundred fifty-five".