181604674801 has 27 divisors (see below), whose sum is σ = 210777434553. Its totient is φ = 156329232840.

The previous prime is 181604674799. The next prime is 181604674807. The reversal of 181604674801 is 108476406181.

The square root of 181604674801 is 426151.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 181604674801 - 2¹ = 181604674799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181604674807) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 89064540 + ... + 89066578.

Almost surely, 2^181604674801 is an apocalyptic number.

181604674801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

181604674801 is the 426151-st square number.

181604674801 is the 213076-th centered octagonal number.

It is an amenable number.

181604674801 is a deficient number, since it is larger than the sum of its proper divisors (29172759752).

181604674801 is an frugal number, since it uses more digits than its factorization.

181604674801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138 (or 2069 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 181604674801 in words is "one hundred eighty-one billion, six hundred four million, six hundred seventy-four thousand, eight hundred one".