19878031168 has 14 divisors (see below), whose sum is σ = 39445468226. Its totient is φ = 9939015552.

The previous prime is 19878031163. The next prime is 19878031171. The reversal of 19878031168 is 86113087891.

It can be written as a sum of positive squares in only one way, i.e., 15803506944 + 4074524224 = 125712^2 + 63832^2 .

It is a super-2 number, since 2×19878031168² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878031163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155297055 + ... + 155297182.

Almost surely, 2^19878031168 is an apocalyptic number.

It is an amenable number.

19878031168 is a deficient number, since it is larger than the sum of its proper divisors (19567437058).

19878031168 is an equidigital number, since it uses as much as digits as its factorization.

19878031168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310594249 (or 310594239 counting only the distinct ones).

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

The spelling of 19878031168 in words is "nineteen billion, eight hundred seventy-eight million, thirty-one thousand, one hundred sixty-eight".