19876430112778 has 16 divisors (see below), whose sum is σ = 30088546832520. Its totient is φ = 9846916761600.

The previous prime is 19876430112767. The next prime is 19876430112811. The reversal of 19876430112778 is 87721103467891.

It can be written as a sum of positive squares in 4 ways, for example, as 19202476135969 + 673953976809 = 4382063^2 + 820947^2 .

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, 18549738 + ... + 19591978.

Almost surely, 2^{19876430112778} is an apocalyptic number.

19876430112778 is a deficient number, since it is larger than the sum of its proper divisors (10212116719742).

19876430112778 is a wasteful number, since it uses less digits than its factorization.

19876430112778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129833.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 19876430112778 in words is "nineteen trillion, eight hundred seventy-six billion, four hundred thirty million, one hundred twelve thousand, seven hundred seventy-eight".