18686891080 has 160 divisors (see below), whose sum is σ = 49723424640. Its totient is φ = 6268304640.

The previous prime is 18686891059. The next prime is 18686891087. The reversal of 18686891080 is 8019868681.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (18686891087) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12566097 + ... + 12567583.

It is an arithmetic number, because the mean of its divisors is an integer number (310771404).

Almost surely, 2^18686891080 is an apocalyptic number.

18686891080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18686891080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24861712320).

18686891080 is an abundant number, since it is smaller than the sum of its proper divisors (31036533560).

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

18686891080 is a wasteful number, since it uses less digits than its factorization.

18686891080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1518 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 55.

The spelling of 18686891080 in words is "eighteen billion, six hundred eighty-six million, eight hundred ninety-one thousand, eighty".