19719149408 has 48 divisors (see below), whose sum is σ = 45567242784. Its totient is φ = 8222653440.

The previous prime is 19719149393. The next prime is 19719149441. The reversal of 19719149408 is 80494191791.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19719149408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1181333 + ... + 1197908.

It is an arithmetic number, because the mean of its divisors is an integer number (949317558).

Almost surely, 2^19719149408 is an apocalyptic number.

It is an amenable number.

19719149408 is an abundant number, since it is smaller than the sum of its proper divisors (25848093376).

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

19719149408 is a wasteful number, since it uses less digits than its factorization.

19719149408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379295 (or 2379287 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 19719149408 in words is "nineteen billion, seven hundred nineteen million, one hundred forty-nine thousand, four hundred eight".