18639474513 has 8 divisors (see below), whose sum is σ = 27111962976. Its totient is φ = 11296651200.

The previous prime is 18639474481. The next prime is 18639474527. The reversal of 18639474513 is 31547493681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18639474513 - 2⁵ = 18639474481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18639474533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282416248 + ... + 282416313.

It is an arithmetic number, because the mean of its divisors is an integer number (3388995372).

Almost surely, 2^18639474513 is an apocalyptic number.

It is an amenable number.

18639474513 is a deficient number, since it is larger than the sum of its proper divisors (8472488463).

18639474513 is a wasteful number, since it uses less digits than its factorization.

18639474513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564832575.

The product of its digits is 2177280, while the sum is 51.

The spelling of 18639474513 in words is "eighteen billion, six hundred thirty-nine million, four hundred seventy-four thousand, five hundred thirteen".