19679012137 has 2 divisors, whose sum is σ = 19679012138. Its totient is φ = 19679012136.

The previous prime is 19679012131. The next prime is 19679012149. The reversal of 19679012137 is 73121097691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19625488281 + 53523856 = 140091^2 + 7316^2 .

It is an emirp because it is prime and its reverse (73121097691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19679012137 - 2¹¹ = 19679010089 is a prime.

It is not a weakly prime, because it can be changed into another prime (19679012131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9839506068 + 9839506069.

It is an arithmetic number, because the mean of its divisors is an integer number (9839506069).

Almost surely, 2^19679012137 is an apocalyptic number.

It is an amenable number.

19679012137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19679012137 is an equidigital number, since it uses as much as digits as its factorization.

19679012137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 19679012137 in words is "nineteen billion, six hundred seventy-nine million, twelve thousand, one hundred thirty-seven".