18894874656 has 96 divisors (see below), whose sum is σ = 58216717440. Its totient is φ = 5252622336.

The previous prime is 18894874651. The next prime is 18894874699. The reversal of 18894874656 is 65647849881.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18894874656² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18894874651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355101 + ... + 404828.

It is an arithmetic number, because the mean of its divisors is an integer number (606424140).

Almost surely, 2^18894874656 is an apocalyptic number.

18894874656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18894874656 is an abundant number, since it is smaller than the sum of its proper divisors (39321842784).

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

18894874656 is a wasteful number, since it uses less digits than its factorization.

18894874656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759986 (or 759978 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 66.

The spelling of 18894874656 in words is "eighteen billion, eight hundred ninety-four million, eight hundred seventy-four thousand, six hundred fifty-six".