19718899776 has 63 divisors (see below), whose sum is σ = 56530327503. Its totient is φ = 6571843200.

The previous prime is 19718899757. The next prime is 19718899799. The reversal of 19718899776 is 67799881791.

It is a happy number.

The square root of 19718899776 is 140424.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3367251 + ... + 3373101.

Almost surely, 2^19718899776 is an apocalyptic number.

19718899776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19718899776 is the 140424-th square number.

It is an amenable number.

19718899776 is an abundant number, since it is smaller than the sum of its proper divisors (36811427727).

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

19718899776 is an frugal number, since it uses more digits than its factorization.

19718899776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11720 (or 5856 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 72.

The spelling of 19718899776 in words is "nineteen billion, seven hundred eighteen million, eight hundred ninety-nine thousand, seven hundred seventy-six".