19961331172 has 96 divisors (see below), whose sum is σ = 38217940992. Its totient is φ = 9097837056.

The previous prime is 19961331121. The next prime is 19961331191. The reversal of 19961331172 is 27113316991.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33661308 + ... + 33661900.

It is an arithmetic number, because the mean of its divisors is an integer number (398103552).

Almost surely, 2^19961331172 is an apocalyptic number.

It is an amenable number.

19961331172 is a deficient number, since it is larger than the sum of its proper divisors (18256609820).

19961331172 is a wasteful number, since it uses less digits than its factorization.

19961331172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 855 counting only the distinct ones).

The product of its digits is 61236, while the sum is 43.

The spelling of 19961331172 in words is "nineteen billion, nine hundred sixty-one million, three hundred thirty-one thousand, one hundred seventy-two".