19145219872 has 24 divisors (see below), whose sum is σ = 39330942336. Its totient is φ = 9156409152.

The previous prime is 19145219861. The next prime is 19145219881. The reversal of 19145219872 is 27891254191.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13005528 + ... + 13006999.

It is an arithmetic number, because the mean of its divisors is an integer number (1638789264).

Almost surely, 2^19145219872 is an apocalyptic number.

It is an amenable number.

19145219872 is an abundant number, since it is smaller than the sum of its proper divisors (20185722464).

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

19145219872 is a wasteful number, since it uses less digits than its factorization.

19145219872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26012560 (or 26012552 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The spelling of 19145219872 in words is "nineteen billion, one hundred forty-five million, two hundred nineteen thousand, eight hundred seventy-two".