18531879678 has 80 divisors (see below), whose sum is σ = 45759588336. Its totient is φ = 5569482240.

The previous prime is 18531879593. The next prime is 18531879683. The reversal of 18531879678 is 87697813581.

18531879678 is a `hidden beast` number, since 1 + 8 + 531 + 8 + 7 + 96 + 7 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11763 + ... + 192878.

Almost surely, 2^18531879678 is an apocalyptic number.

18531879678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18531879678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22879794168).

18531879678 is an abundant number, since it is smaller than the sum of its proper divisors (27227708658).

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

18531879678 is a wasteful number, since it uses less digits than its factorization.

18531879678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204711 (or 204702 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 18531879678 in words is "eighteen billion, five hundred thirty-one million, eight hundred seventy-nine thousand, six hundred seventy-eight".