19617047979989 has 2 divisors, whose sum is σ = 19617047979990. Its totient is φ = 19617047979988.

The previous prime is 19617047979953. The next prime is 19617047980003. The reversal of 19617047979989 is 98997974071691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19603553208100 + 13494771889 = 4427590^2 + 116167^2 .

It is a cyclic number.

It is not a de Polignac number, because 19617047979989 - 2¹² = 19617047975893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19617047979989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19617047079989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9808523989994 + 9808523989995.

It is an arithmetic number, because the mean of its divisors is an integer number (9808523989995).

Almost surely, 2^{19617047979989} is an apocalyptic number.

It is an amenable number.

19617047979989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19617047979989 is an equidigital number, since it uses as much as digits as its factorization.

19617047979989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888730944, while the sum is 86.

The spelling of 19617047979989 in words is "nineteen trillion, six hundred seventeen billion, forty-seven million, nine hundred seventy-nine thousand, nine hundred eighty-nine".