769665857 has 2 divisors, whose sum is σ = 769665858. Its totient is φ = 769665856.

The previous prime is 769665839. The next prime is 769665877. The reversal of 769665857 is 758566967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610880656 + 158785201 = 24716^2 + 12601^2 .

It is an emirp because it is prime and its reverse (758566967) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-769665857 is a prime.

It is a super-3 number, since 3×769665857³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 769665796 and 769665805.

It is not a weakly prime, because it can be changed into another prime (769665877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384832928 + 384832929.

It is an arithmetic number, because the mean of its divisors is an integer number (384832929).

Almost surely, 2^769665857 is an apocalyptic number.

It is an amenable number.

769665857 is a deficient number, since it is larger than the sum of its proper divisors (1).

769665857 is an equidigital number, since it uses as much as digits as its factorization.

769665857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 59.

The square root of 769665857 is about 27742.8523587608. The cubic root of 769665857 is about 916.4330444346.

The spelling of 769665857 in words is "seven hundred sixty-nine million, six hundred sixty-five thousand, eight hundred fifty-seven".