181366855 has 16 divisors (see below), whose sum is σ = 220248000. Its totient is φ = 143366400.

The previous prime is 181366849. The next prime is 181366877. The reversal of 181366855 is 558663181.

It is not a de Polignac number, because 181366855 - 2¹⁹ = 180842567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172371 + ... + 173419.

It is an arithmetic number, because the mean of its divisors is an integer number (13765500).

Almost surely, 2^181366855 is an apocalyptic number.

181366855 is a deficient number, since it is larger than the sum of its proper divisors (38881145).

181366855 is a wasteful number, since it uses less digits than its factorization.

181366855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434.

The product of its digits is 172800, while the sum is 43.

The square root of 181366855 is about 13467.2512043104. The cubic root of 181366855 is about 566.0471925173.

The spelling of 181366855 in words is "one hundred eighty-one million, three hundred sixty-six thousand, eight hundred fifty-five".