19891172248 has 32 divisors (see below), whose sum is σ = 38969602560. Its totient is φ = 9500436000.

The previous prime is 19891172209. The next prime is 19891172281. The reversal of 19891172248 is 84227119891.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19891172195 and 19891172204.

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, 66211 + ... + 210157.

It is an arithmetic number, because the mean of its divisors is an integer number (1217800080).

Almost surely, 2^19891172248 is an apocalyptic number.

It is an amenable number.

19891172248 is a deficient number, since it is larger than the sum of its proper divisors (19078430312).

19891172248 is a wasteful number, since it uses less digits than its factorization.

19891172248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144727 (or 144723 counting only the distinct ones).

The product of its digits is 580608, while the sum is 52.

The spelling of 19891172248 in words is "nineteen billion, eight hundred ninety-one million, one hundred seventy-two thousand, two hundred forty-eight".