161235636255 has 24 divisors (see below), whose sum is σ = 279484452000. Its totient is φ = 85989462720.

The previous prime is 161235636229. The next prime is 161235636271. The reversal of 161235636255 is 552636532161.

161235636255 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 3 + 5 + 636 + 2 + 5 + 5 = 666.

It is not a de Polignac number, because 161235636255 - 2¹⁶ = 161235570719 is a prime.

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 161235636255.

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, 2533525 + ... + 2596385.

It is an arithmetic number, because the mean of its divisors is an integer number (11645185500).

Almost surely, 2^161235636255 is an apocalyptic number.

161235636255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161235636255 is a deficient number, since it is larger than the sum of its proper divisors (118248815745).

161235636255 is a wasteful number, since it uses less digits than its factorization.

161235636255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119871 (or 119868 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The spelling of 161235636255 in words is "one hundred sixty-one billion, two hundred thirty-five million, six hundred thirty-six thousand, two hundred fifty-five".