18227430081 has 45 divisors (see below), whose sum is σ = 31688907921. Its totient is φ = 10410814008.

The previous prime is 18227430071. The next prime is 18227430119. The reversal of 18227430081 is 18003472281.

The square root of 18227430081 is 135009.

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

18227430081 is a `hidden beast` number, since 1 + 8 + 2 + 274 + 300 + 81 = 666.

It is not a de Polignac number, because 18227430081 - 2¹⁷ = 18227299009 is a prime.

It is a super-2 number, since 2×18227430081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18227430071) 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, 8504496 + ... + 8506638.

Almost surely, 2^18227430081 is an apocalyptic number.

18227430081 is the 135009-th square number.

18227430081 is the 67505-th centered octagonal number.

It is an amenable number.

18227430081 is a deficient number, since it is larger than the sum of its proper divisors (13461477840).

18227430081 is an frugal number, since it uses more digits than its factorization.

18227430081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

Multiplying 18227430081 by its sum of digits (36), we get a square (656187482916 = 810054²).

The spelling of 18227430081 in words is "eighteen billion, two hundred twenty-seven million, four hundred thirty thousand, eighty-one".