181127856205 has 24 divisors (see below), whose sum is σ = 231190986312. Its totient is φ = 136124303616.

The previous prime is 181127856193. The next prime is 181127856227. The reversal of 181127856205 is 502658721181.

It can be written as a sum of positive squares in 12 ways, for example, as 1763748009 + 179364108196 = 41997^2 + 423514^2 .

It is not a de Polignac number, because 181127856205 - 2²³ = 181119467597 is a prime.

It is a Duffinian number.

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, 426502 + ... + 737671.

It is an arithmetic number, because the mean of its divisors is an integer number (9632957763).

Almost surely, 2^181127856205 is an apocalyptic number.

It is an amenable number.

181127856205 is a deficient number, since it is larger than the sum of its proper divisors (50063130107).

181127856205 is a wasteful number, since it uses less digits than its factorization.

181127856205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164273 (or 1164244 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 46.

The spelling of 181127856205 in words is "one hundred eighty-one billion, one hundred twenty-seven million, eight hundred fifty-six thousand, two hundred five".