780839938057 has 2 divisors, whose sum is σ = 780839938058. Its totient is φ = 780839938056.

The previous prime is 780839938027. The next prime is 780839938111. The reversal of 780839938057 is 750839938087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673612506121 + 107227431936 = 820739^2 + 327456^2 .

It is a cyclic number.

It is not a de Polignac number, because 780839938057 - 2¹⁵ = 780839905289 is a prime.

It is a super-2 number, since 2×780839938057² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780839937983 and 780839938001.

It is not a weakly prime, because it can be changed into another prime (780839938027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390419969028 + 390419969029.

It is an arithmetic number, because the mean of its divisors is an integer number (390419969029).

Almost surely, 2^780839938057 is an apocalyptic number.

It is an amenable number.

780839938057 is a deficient number, since it is larger than the sum of its proper divisors (1).

780839938057 is an equidigital number, since it uses as much as digits as its factorization.

780839938057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91445760, while the sum is 67.

The spelling of 780839938057 in words is "seven hundred eighty billion, eight hundred thirty-nine million, nine hundred thirty-eight thousand, fifty-seven".