779425643 has 2 divisors, whose sum is σ = 779425644. Its totient is φ = 779425642.

The previous prime is 779425631. The next prime is 779425727. The reversal of 779425643 is 346524977.

It is a weak prime.

It is an emirp because it is prime and its reverse (346524977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 779425643 - 2¹² = 779421547 is a prime.

It is not a weakly prime, because it can be changed into another prime (779425043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389712821 + 389712822.

It is an arithmetic number, because the mean of its divisors is an integer number (389712822).

Almost surely, 2^779425643 is an apocalyptic number.

779425643 is a deficient number, since it is larger than the sum of its proper divisors (1).

779425643 is an equidigital number, since it uses as much as digits as its factorization.

779425643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 47.

The square root of 779425643 is about 27918.1955541543. The cubic root of 779425643 is about 920.2904104450.

The spelling of 779425643 in words is "seven hundred seventy-nine million, four hundred twenty-five thousand, six hundred forty-three".