19687931412894 has 16 divisors (see below), whose sum is σ = 43750958695440. Its totient is φ = 6562643804280.

The previous prime is 19687931412859. The next prime is 19687931412907. The reversal of 19687931412894 is 49821413978691.

19687931412894 is a `hidden beast` number, since 1 + 9 + 68 + 79 + 3 + 1 + 412 + 89 + 4 = 666.

It is a super-2 number, since 2×19687931412894² (a number of 27 digits) contains 22 as substring.

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, 182295661177 + ... + 182295661284.

It is an arithmetic number, because the mean of its divisors is an integer number (2734434918465).

Almost surely, 2^{19687931412894} is an apocalyptic number.

19687931412894 is an abundant number, since it is smaller than the sum of its proper divisors (24063027282546).

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

19687931412894 is a wasteful number, since it uses less digits than its factorization.

19687931412894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364591322472 (or 364591322466 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 72.

The spelling of 19687931412894 in words is "nineteen trillion, six hundred eighty-seven billion, nine hundred thirty-one million, four hundred twelve thousand, eight hundred ninety-four".