866777697 has 12 divisors (see below), whose sum is σ = 1254589440. Its totient is φ = 576662328.

The previous prime is 866777693. The next prime is 866777699. The reversal of 866777697 is 796777668.

It is not a de Polignac number, because 866777697 - 2² = 866777693 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (866777693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94497 + ... + 103262.

It is an arithmetic number, because the mean of its divisors is an integer number (104549120).

Almost surely, 2^866777697 is an apocalyptic number.

It is an amenable number.

866777697 is a deficient number, since it is larger than the sum of its proper divisors (387811743).

866777697 is a wasteful number, since it uses less digits than its factorization.

866777697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198252 (or 198249 counting only the distinct ones).

The product of its digits is 37340352, while the sum is 63.

The square root of 866777697 is about 29441.0885838143. The cubic root of 866777697 is about 953.4602150578.

The spelling of 866777697 in words is "eight hundred sixty-six million, seven hundred seventy-seven thousand, six hundred ninety-seven".