818809624161 has 9 divisors (see below), whose sum is σ = 1182728933841. Its totient is φ = 545871273012.

The previous prime is 818809624151. The next prime is 818809624207. The reversal of 818809624161 is 161426908818.

It is a happy number.

The square root of 818809624161 is 904881.

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

818809624161 is a `hidden beast` number, since 8 + 1 + 8 + 8 + 0 + 9 + 624 + 1 + 6 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 818809624161 - 2⁷ = 818809624033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 818809624098 and 818809624107.

It is not an unprimeable number, because it can be changed into a prime (818809624151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2563830 + ... + 2865456.

Almost surely, 2^818809624161 is an apocalyptic number.

818809624161 is the 904881-st square number.

818809624161 is the 452441-st centered octagonal number.

It is an amenable number.

818809624161 is a deficient number, since it is larger than the sum of its proper divisors (363919309680).

818809624161 is an frugal number, since it uses more digits than its factorization.

818809624161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603260 (or 301630 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 818809624161 in words is "eight hundred eighteen billion, eight hundred nine million, six hundred twenty-four thousand, one hundred sixty-one".