19678039193 has 2 divisors, whose sum is σ = 19678039194. Its totient is φ = 19678039192.

The previous prime is 19678039141. The next prime is 19678039219. The reversal of 19678039193 is 39193087691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15672035344 + 4006003849 = 125188^2 + 63293^2 .

It is a cyclic number.

It is not a de Polignac number, because 19678039193 - 2⁸ = 19678038937 is a prime.

It is not a weakly prime, because it can be changed into another prime (19678039103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9839019596 + 9839019597.

It is an arithmetic number, because the mean of its divisors is an integer number (9839019597).

Almost surely, 2^19678039193 is an apocalyptic number.

It is an amenable number.

19678039193 is a deficient number, since it is larger than the sum of its proper divisors (1).

19678039193 is an equidigital number, since it uses as much as digits as its factorization.

19678039193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 19678039193 in words is "nineteen billion, six hundred seventy-eight million, thirty-nine thousand, one hundred ninety-three".