18043625568 has 24 divisors (see below), whose sum is σ = 47364517368. Its totient is φ = 6014541824.

The previous prime is 18043625539. The next prime is 18043625581. The reversal of 18043625568 is 86552634081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93977121 + ... + 93977312.

It is an arithmetic number, because the mean of its divisors is an integer number (1973521557).

Almost surely, 2^18043625568 is an apocalyptic number.

It is an amenable number.

18043625568 is an abundant number, since it is smaller than the sum of its proper divisors (29320891800).

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

18043625568 is a wasteful number, since it uses less digits than its factorization.

18043625568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187954446 (or 187954438 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 18043625568 in words is "eighteen billion, forty-three million, six hundred twenty-five thousand, five hundred sixty-eight".