18227081577 has 32 divisors (see below), whose sum is σ = 26098414720. Its totient is φ = 11281420800.

The previous prime is 18227081557. The next prime is 18227081581. The reversal of 18227081577 is 77518072281.

It is a happy number.

It is not a de Polignac number, because 18227081577 - 2⁶ = 18227081513 is a prime.

It is a super-2 number, since 2×18227081577² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18227081557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 639327 + ... + 667227.

It is an arithmetic number, because the mean of its divisors is an integer number (815575460).

Almost surely, 2^18227081577 is an apocalyptic number.

It is an amenable number.

18227081577 is a deficient number, since it is larger than the sum of its proper divisors (7871333143).

18227081577 is a wasteful number, since it uses less digits than its factorization.

18227081577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28153.

The product of its (nonzero) digits is 439040, while the sum is 48.

The spelling of 18227081577 in words is "eighteen billion, two hundred twenty-seven million, eighty-one thousand, five hundred seventy-seven".