857919653777 has 2 divisors, whose sum is σ = 857919653778. Its totient is φ = 857919653776.

The previous prime is 857919653749. The next prime is 857919653807. The reversal of 857919653777 is 777356919758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441745000321 + 416174653456 = 664639^2 + 645116^2 .

It is a cyclic number.

It is not a de Polignac number, because 857919653777 - 2¹⁸ = 857919391633 is a prime.

It is a super-2 number, since 2×857919653777² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857919653377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428959826888 + 428959826889.

It is an arithmetic number, because the mean of its divisors is an integer number (428959826889).

Almost surely, 2^857919653777 is an apocalyptic number.

It is an amenable number.

857919653777 is a deficient number, since it is larger than the sum of its proper divisors (1).

857919653777 is an equidigital number, since it uses as much as digits as its factorization.

857919653777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 700131600, while the sum is 74.

The spelling of 857919653777 in words is "eight hundred fifty-seven billion, nine hundred nineteen million, six hundred fifty-three thousand, seven hundred seventy-seven".