19916513280 has 784 divisors, whose sum is σ = 77356594080. Its totient is φ = 4904976384.

The previous prime is 19916513231. The next prime is 19916513311. The reversal of 19916513280 is 8231561991.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 686776306 + ... + 686776334.

Almost surely, 2^19916513280 is an apocalyptic number.

19916513280 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 19916513280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38678297040).

19916513280 is an abundant number, since it is smaller than the sum of its proper divisors (57440080800).

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

19916513280 is an frugal number, since it uses more digits than its factorization.

19916513280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 19916513280 in words is "nineteen billion, nine hundred sixteen million, five hundred thirteen thousand, two hundred eighty".