18638578948 has 24 divisors (see below), whose sum is σ = 35685314784. Its totient is φ = 8447659200.

The previous prime is 18638578921. The next prime is 18638578963. The reversal of 18638578948 is 84987583681.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595113 + ... + 625648.

It is an arithmetic number, because the mean of its divisors is an integer number (1486888116).

Almost surely, 2^18638578948 is an apocalyptic number.

It is an amenable number.

18638578948 is a deficient number, since it is larger than the sum of its proper divisors (17046735836).

18638578948 is a wasteful number, since it uses less digits than its factorization.

18638578948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221123 (or 1221121 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 67.

The spelling of 18638578948 in words is "eighteen billion, six hundred thirty-eight million, five hundred seventy-eight thousand, nine hundred forty-eight".