19517819372 has 12 divisors (see below), whose sum is σ = 34716121776. Its totient is φ = 9598927440.

The previous prime is 19517819371. The next prime is 19517819393. The reversal of 19517819372 is 27391871591.

It is a happy number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (19517819371) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 39995288 + ... + 39995775.

It is an arithmetic number, because the mean of its divisors is an integer number (2893010148).

Almost surely, 2^19517819372 is an apocalyptic number.

It is an amenable number.

19517819372 is a deficient number, since it is larger than the sum of its proper divisors (15198302404).

19517819372 is a wasteful number, since it uses less digits than its factorization.

19517819372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79991128 (or 79991126 counting only the distinct ones).

The product of its digits is 952560, while the sum is 53.

The spelling of 19517819372 in words is "nineteen billion, five hundred seventeen million, eight hundred nineteen thousand, three hundred seventy-two".