19974916679 has 2 divisors, whose sum is σ = 19974916680. Its totient is φ = 19974916678.

The previous prime is 19974916613. The next prime is 19974916729. The reversal of 19974916679 is 97661947991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19974916679 - 2¹² = 19974912583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19974910679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987458339 + 9987458340.

It is an arithmetic number, because the mean of its divisors is an integer number (9987458340).

Almost surely, 2^19974916679 is an apocalyptic number.

19974916679 is a deficient number, since it is larger than the sum of its proper divisors (1).

19974916679 is an equidigital number, since it uses as much as digits as its factorization.

19974916679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 68.

The spelling of 19974916679 in words is "nineteen billion, nine hundred seventy-four million, nine hundred sixteen thousand, six hundred seventy-nine".