18916644952920 has 1024 divisors, whose sum is σ = 76039396392960. Its totient is φ = 3687896678400.

The previous prime is 18916644952771. The next prime is 18916644952957. The reversal of 18916644952920 is 2925944661981.

It is a happy number.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 207950887 + ... + 208041833.

It is an arithmetic number, because the mean of its divisors is an integer number (74257223040).

Almost surely, 2^{18916644952920} is an apocalyptic number.

18916644952920 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 18916644952920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38019698196480).

18916644952920 is an abundant number, since it is smaller than the sum of its proper divisors (57122751440040).

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

18916644952920 is a wasteful number, since it uses less digits than its factorization.

18916644952920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91056 (or 91052 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 66.

The spelling of 18916644952920 in words is "eighteen trillion, nine hundred sixteen billion, six hundred forty-four million, nine hundred fifty-two thousand, nine hundred twenty".