779519999989 has 2 divisors, whose sum is σ = 779519999990. Its totient is φ = 779519999988.

The previous prime is 779519999983. The next prime is 779520000011. The reversal of 779519999989 is 989999915977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651200580900 + 128319419089 = 806970^2 + 358217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-779519999989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (779519999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389759999994 + 389759999995.

It is an arithmetic number, because the mean of its divisors is an integer number (389759999995).

Almost surely, 2^779519999989 is an apocalyptic number.

It is an amenable number.

779519999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

779519999989 is an equidigital number, since it uses as much as digits as its factorization.

779519999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9374619240, while the sum is 91.

The spelling of 779519999989 in words is "seven hundred seventy-nine billion, five hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-nine".