866965655 has 4 divisors (see below), whose sum is σ = 1040358792. Its totient is φ = 693572520.

The previous prime is 866965639. The next prime is 866965661. The reversal of 866965655 is 556569668.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 866965655 - 2⁴ = 866965639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866965655.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 86696561 + ... + 86696570.

It is an arithmetic number, because the mean of its divisors is an integer number (260089698).

Almost surely, 2^866965655 is an apocalyptic number.

866965655 is a deficient number, since it is larger than the sum of its proper divisors (173393137).

866965655 is a wasteful number, since it uses less digits than its factorization.

866965655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173393136.

The product of its digits is 11664000, while the sum is 56.

The square root of 866965655 is about 29444.2805142187. The cubic root of 866965655 is about 953.5291283534.

The spelling of 866965655 in words is "eight hundred sixty-six million, nine hundred sixty-five thousand, six hundred fifty-five".