19964172144 has 80 divisors (see below), whose sum is σ = 58975169792. Its totient is φ = 5700824064.

The previous prime is 19964172101. The next prime is 19964172161. The reversal of 19964172144 is 44127146991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 19964172093 and 19964172102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613467 + ... + 645189.

Almost surely, 2^19964172144 is an apocalyptic number.

19964172144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19964172144 is an abundant number, since it is smaller than the sum of its proper divisors (39010997648).

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

19964172144 is a wasteful number, since it uses less digits than its factorization.

19964172144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33614 (or 33608 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The spelling of 19964172144 in words is "nineteen billion, nine hundred sixty-four million, one hundred seventy-two thousand, one hundred forty-four".