18118657764 has 18 divisors (see below), whose sum is σ = 45799940550. Its totient is φ = 6039552576.

The previous prime is 18118657763. The next prime is 18118657801. The reversal of 18118657764 is 46775681181.

18118657764 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 8 + 6 + 577 + 64 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18052072164 + 66585600 = 134358^2 + 8160^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 18118657764.

It is not an unprimeable number, because it can be changed into a prime (18118657763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251647989 + ... + 251648060.

Almost surely, 2^18118657764 is an apocalyptic number.

It is an amenable number.

18118657764 is an abundant number, since it is smaller than the sum of its proper divisors (27681282786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18118657764 is a wasteful number, since it uses less digits than its factorization.

18118657764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503296059 (or 503296054 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The spelling of 18118657764 in words is "eighteen billion, one hundred eighteen million, six hundred fifty-seven thousand, seven hundred sixty-four".