19982699987 has 2 divisors, whose sum is σ = 19982699988. Its totient is φ = 19982699986.

The previous prime is 19982699959. The next prime is 19982700011. The reversal of 19982699987 is 78999628991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19982699987 - 2¹⁰ = 19982698963 is a prime.

It is not a weakly prime, because it can be changed into another prime (19982699287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991349993 + 9991349994.

It is an arithmetic number, because the mean of its divisors is an integer number (9991349994).

Almost surely, 2^19982699987 is an apocalyptic number.

19982699987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19982699987 is an equidigital number, since it uses as much as digits as its factorization.

19982699987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317447424, while the sum is 77.

The spelling of 19982699987 in words is "nineteen billion, nine hundred eighty-two million, six hundred ninety-nine thousand, nine hundred eighty-seven".