19778125597 has 2 divisors, whose sum is σ = 19778125598. Its totient is φ = 19778125596.

The previous prime is 19778125589. The next prime is 19778125613. The reversal of 19778125597 is 79552187791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11760534916 + 8017590681 = 108446^2 + 89541^2 .

It is a cyclic number.

It is not a de Polignac number, because 19778125597 - 2³ = 19778125589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19778125097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889062798 + 9889062799.

It is an arithmetic number, because the mean of its divisors is an integer number (9889062799).

Almost surely, 2^19778125597 is an apocalyptic number.

It is an amenable number.

19778125597 is a deficient number, since it is larger than the sum of its proper divisors (1).

19778125597 is an equidigital number, since it uses as much as digits as its factorization.

19778125597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11113200, while the sum is 61.

The spelling of 19778125597 in words is "nineteen billion, seven hundred seventy-eight million, one hundred twenty-five thousand, five hundred ninety-seven".