19899211776 has 56 divisors (see below), whose sum is σ = 53061391464. Its totient is φ = 6633062400.

The previous prime is 19899211771. The next prime is 19899211811. The reversal of 19899211776 is 67711299891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19899211771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380275 + ... + 429426.

Almost surely, 2^19899211776 is an apocalyptic number.

19899211776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19899211776 is an abundant number, since it is smaller than the sum of its proper divisors (33162179688).

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

19899211776 is an frugal number, since it uses more digits than its factorization.

19899211776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809730 (or 809706 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 60.

The spelling of 19899211776 in words is "nineteen billion, eight hundred ninety-nine million, two hundred eleven thousand, seven hundred seventy-six".