18816778120 has 96 divisors (see below), whose sum is σ = 49342884480. Its totient is φ = 6439305600.

The previous prime is 18816778103. The next prime is 18816778157. The reversal of 18816778120 is 2187761881.

It is a super-2 number, since 2×18816778120² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1063345 + ... + 1080895.

It is an arithmetic number, because the mean of its divisors is an integer number (513988380).

Almost surely, 2^18816778120 is an apocalyptic number.

18816778120 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 18816778120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24671442240).

18816778120 is an abundant number, since it is smaller than the sum of its proper divisors (30526106360).

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

18816778120 is a wasteful number, since it uses less digits than its factorization.

18816778120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18123 (or 18112 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 49.

The spelling of 18816778120 in words is "eighteen billion, eight hundred sixteen million, seven hundred seventy-eight thousand, one hundred twenty".