19867979368 has 8 divisors (see below), whose sum is σ = 37252461330. Its totient is φ = 9933989680.

The previous prime is 19867979357. The next prime is 19867979381. The reversal of 19867979368 is 86397976891.

It can be written as a sum of positive squares in only one way, i.e., 12263790564 + 7604188804 = 110742^2 + 87202^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 19867979368.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1241748703 + ... + 1241748718.

Almost surely, 2^19867979368 is an apocalyptic number.

It is an amenable number.

19867979368 is a deficient number, since it is larger than the sum of its proper divisors (17384481962).

19867979368 is a wasteful number, since it uses less digits than its factorization.

19867979368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483497427 (or 2483497423 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 73.

The spelling of 19867979368 in words is "nineteen billion, eight hundred sixty-seven million, nine hundred seventy-nine thousand, three hundred sixty-eight".