18990959768 has 16 divisors (see below), whose sum is σ = 38845145160. Its totient is φ = 8632254400.

The previous prime is 18990959759. The next prime is 18990959789. The reversal of 18990959768 is 86795909981.

It is a happy number.

It is a super-2 number, since 2×18990959768² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107903093 + ... + 107903268.

Almost surely, 2^18990959768 is an apocalyptic number.

It is an amenable number.

18990959768 is an abundant number, since it is smaller than the sum of its proper divisors (19854185392).

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

18990959768 is a wasteful number, since it uses less digits than its factorization.

18990959768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215806378 (or 215806374 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 71.

The spelling of 18990959768 in words is "eighteen billion, nine hundred ninety million, nine hundred fifty-nine thousand, seven hundred sixty-eight".