18013751968 has 24 divisors (see below), whose sum is σ = 35467668180. Its totient is φ = 9006090240.

The previous prime is 18013751881. The next prime is 18013751981. The reversal of 18013751968 is 86915731081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10901865744 + 7111886224 = 104412^2 + 84332^2 .

It is a super-3 number, since 3×18013751968³ (a number of 32 digits) contains 333 as substring.

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, 567888 + ... + 598768.

Almost surely, 2^18013751968 is an apocalyptic number.

It is an amenable number.

18013751968 is a deficient number, since it is larger than the sum of its proper divisors (17453916212).

18013751968 is a wasteful number, since it uses less digits than its factorization.

18013751968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49120 (or 49112 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 18013751968 in words is "eighteen billion, thirteen million, seven hundred fifty-one thousand, nine hundred sixty-eight".