19519172380 has 24 divisors (see below), whose sum is σ = 41862397248. Its totient is φ = 7641547968.

The previous prime is 19519172371. The next prime is 19519172401. The reversal of 19519172380 is 8327191591.

It is a self number, because there is not a number n which added to its sum of digits gives 19519172380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10381599 + ... + 10383478.

It is an arithmetic number, because the mean of its divisors is an integer number (1744266552).

Almost surely, 2^19519172380 is an apocalyptic number.

19519172380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19519172380 is an abundant number, since it is smaller than the sum of its proper divisors (22343224868).

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

19519172380 is a wasteful number, since it uses less digits than its factorization.

19519172380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20765133 (or 20765131 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 19519172380 in words is "nineteen billion, five hundred nineteen million, one hundred seventy-two thousand, three hundred eighty".