18478860944 has 20 divisors (see below), whose sum is σ = 35904228396. Its totient is φ = 9213253632.

The previous prime is 18478860943. The next prime is 18478861067. The reversal of 18478860944 is 44906887481.

It can be written as a sum of positive squares in 2 ways, for example, as 11854854400 + 6624006544 = 108880^2 + 81388^2 .

It is a super-2 number, since 2×18478860944² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18478860943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1630229 + ... + 1641524.

Almost surely, 2^18478860944 is an apocalyptic number.

It is an amenable number.

18478860944 is a deficient number, since it is larger than the sum of its proper divisors (17425367452).

18478860944 is a wasteful number, since it uses less digits than its factorization.

18478860944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272114 (or 3272108 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 18478860944 in words is "eighteen billion, four hundred seventy-eight million, eight hundred sixty thousand, nine hundred forty-four".