19974916666 has 8 divisors (see below), whose sum is σ = 31724867700. Its totient is φ = 9399960768.

The previous prime is 19974916613. The next prime is 19974916679. The reversal of 19974916666 is 66661947991.

It can be written as a sum of positive squares in 2 ways, for example, as 18877386025 + 1097530641 = 137395^2 + 33129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 19974916598 and 19974916607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293748741 + ... + 293748808.

Almost surely, 2^19974916666 is an apocalyptic number.

19974916666 is a deficient number, since it is larger than the sum of its proper divisors (11749951034).

19974916666 is a wasteful number, since it uses less digits than its factorization.

19974916666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587497568.

The product of its digits is 26453952, while the sum is 64.

The spelling of 19974916666 in words is "nineteen billion, nine hundred seventy-four million, nine hundred sixteen thousand, six hundred sixty-six".