853666779 has 12 divisors (see below), whose sum is σ = 1324054824. Its totient is φ = 487809504.

The previous prime is 853666741. The next prime is 853666783. The reversal of 853666779 is 977666358.

It is not a de Polignac number, because 853666779 - 2¹⁷ = 853535707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (853666739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2903482 + ... + 2903775.

It is an arithmetic number, because the mean of its divisors is an integer number (110337902).

Almost surely, 2^853666779 is an apocalyptic number.

853666779 is a deficient number, since it is larger than the sum of its proper divisors (470388045).

853666779 is a wasteful number, since it uses less digits than its factorization.

853666779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5807274 (or 5807267 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 57.

The square root of 853666779 is about 29217.5765422117. The cubic root of 853666779 is about 948.6284099692.

The spelling of 853666779 in words is "eight hundred fifty-three million, six hundred sixty-six thousand, seven hundred seventy-nine".