18681783120 has 1440 divisors, whose sum is σ = 89856748800. Its totient is φ = 3427522560.

The previous prime is 18681783119. The next prime is 18681783121. The reversal of 18681783120 is 2138718681.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18681783119) and next prime (18681783121).

It is a super-4 number, since 4×18681783120⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18681783121) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 812251429 + ... + 812251451.

It is an arithmetic number, because the mean of its divisors is an integer number (62400520).

Almost surely, 2^18681783120 is an apocalyptic number.

18681783120 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 18681783120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44928374400).

18681783120 is an abundant number, since it is smaller than the sum of its proper divisors (71174965680).

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

18681783120 is a wasteful number, since it uses less digits than its factorization.

18681783120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 18681783120 in words is "eighteen billion, six hundred eighty-one million, seven hundred eighty-three thousand, one hundred twenty".