18978662850 has 288 divisors, whose sum is σ = 57021796800. Its totient is φ = 4160217600.

The previous prime is 18978662803. The next prime is 18978662851. The reversal of 18978662850 is 5826687981.

It is not an unprimeable number, because it can be changed into a prime (18978662851) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 57337185 + ... + 57337515.

It is an arithmetic number, because the mean of its divisors is an integer number (197992350).

Almost surely, 2^18978662850 is an apocalyptic number.

18978662850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18978662850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28510898400).

18978662850 is an abundant number, since it is smaller than the sum of its proper divisors (38043133950).

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

18978662850 is a wasteful number, since it uses less digits than its factorization.

18978662850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 18978662850 in words is "eighteen billion, nine hundred seventy-eight million, six hundred sixty-two thousand, eight hundred fifty".