18617948478 has 48 divisors (see below), whose sum is σ = 41642480880. Its totient is φ = 6007986432.

The previous prime is 18617948477. The next prime is 18617948501. The reversal of 18617948478 is 87484971681.

18617948478 is a `hidden beast` number, since 1 + 8 + 617 + 9 + 4 + 8 + 4 + 7 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18617948477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18973 + ... + 193896.

It is an arithmetic number, because the mean of its divisors is an integer number (867551685).

Almost surely, 2^18617948478 is an apocalyptic number.

18617948478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18617948478 is an abundant number, since it is smaller than the sum of its proper divisors (23024532402).

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

18617948478 is a wasteful number, since it uses less digits than its factorization.

18617948478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213033 (or 213030 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The spelling of 18617948478 in words is "eighteen billion, six hundred seventeen million, nine hundred forty-eight thousand, four hundred seventy-eight".