780775780079 has 2 divisors, whose sum is σ = 780775780080. Its totient is φ = 780775780078.

The previous prime is 780775780021. The next prime is 780775780087. The reversal of 780775780079 is 970087577087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780775780079 is a prime.

It is a super-2 number, since 2×780775780079² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780775779997 and 780775780024.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780775780579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390387890039 + 390387890040.

It is an arithmetic number, because the mean of its divisors is an integer number (390387890040).

Almost surely, 2^780775780079 is an apocalyptic number.

780775780079 is a deficient number, since it is larger than the sum of its proper divisors (1).

780775780079 is an equidigital number, since it uses as much as digits as its factorization.

780775780079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48404160, while the sum is 65.

The spelling of 780775780079 in words is "seven hundred eighty billion, seven hundred seventy-five million, seven hundred eighty thousand, seventy-nine".