18222570081 has 45 divisors (see below), whose sum is σ = 27843055779. Its totient is φ = 11877048144.

The previous prime is 18222570073. The next prime is 18222570083. The reversal of 18222570081 is 18007522281.

The square root of 18222570081 is 134991.

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

18222570081 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 2 + 570 + 0 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13136598225 + 5085971856 = 114615^2 + 71316^2 .

It is not a de Polignac number, because 18222570081 - 2³ = 18222570073 is a prime.

It is a super-2 number, since 2×18222570081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18222570083) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 64390566 + ... + 64390848.

Almost surely, 2^18222570081 is an apocalyptic number.

18222570081 is the 134991-st square number.

18222570081 is the 67496-th centered octagonal number.

It is an amenable number.

18222570081 is a deficient number, since it is larger than the sum of its proper divisors (9620485698).

18222570081 is an frugal number, since it uses more digits than its factorization.

18222570081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

Multiplying 18222570081 by its sum of digits (36), we get a square (656012522916 = 809946²).

The spelling of 18222570081 in words is "eighteen billion, two hundred twenty-two million, five hundred seventy thousand, eighty-one".