19399372545 has 32 divisors (see below), whose sum is σ = 35484187392. Its totient is φ = 8865522432.

The previous prime is 19399372513. The next prime is 19399372567. The reversal of 19399372545 is 54527399391.

It is not a de Polignac number, because 19399372545 - 2⁵ = 19399372513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331299 + ... + 385431.

It is an arithmetic number, because the mean of its divisors is an integer number (1108880856).

Almost surely, 2^19399372545 is an apocalyptic number.

19399372545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19399372545 is a deficient number, since it is larger than the sum of its proper divisors (16084814847).

19399372545 is a wasteful number, since it uses less digits than its factorization.

19399372545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57561.

The product of its digits is 9185400, while the sum is 57.

The spelling of 19399372545 in words is "nineteen billion, three hundred ninety-nine million, three hundred seventy-two thousand, five hundred forty-five".