19387424550 has 48 divisors (see below), whose sum is σ = 51779342160. Its totient is φ = 4772288640.

The previous prime is 19387424531. The next prime is 19387424587. The reversal of 19387424550 is 5542478391.

It is a self number, because there is not a number n which added to its sum of digits gives 19387424550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4969185 + ... + 4973084.

It is an arithmetic number, because the mean of its divisors is an integer number (1078736295).

Almost surely, 2^19387424550 is an apocalyptic number.

19387424550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19387424550 is an abundant number, since it is smaller than the sum of its proper divisors (32391917610).

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

19387424550 is a wasteful number, since it uses less digits than its factorization.

19387424550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942297 (or 9942292 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 19387424550 in words is "nineteen billion, three hundred eighty-seven million, four hundred twenty-four thousand, five hundred fifty".