866349977 has 4 divisors (see below), whose sum is σ = 866438196. Its totient is φ = 866261760.

The previous prime is 866349961. The next prime is 866349983. The reversal of 866349977 is 779943668.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 373687561 + 492662416 = 19331^2 + 22196^2 .

It is a cyclic number.

It is not a de Polignac number, because 866349977 - 2⁴ = 866349961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866349907) 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 3 ways as a sum of consecutive naturals, for example, 27224 + ... + 49737.

It is an arithmetic number, because the mean of its divisors is an integer number (216609549).

Almost surely, 2^866349977 is an apocalyptic number.

It is an amenable number.

866349977 is a deficient number, since it is larger than the sum of its proper divisors (88219).

866349977 is a wasteful number, since it uses less digits than its factorization.

866349977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88218.

The product of its digits is 13716864, while the sum is 59.

The square root of 866349977 is about 29433.8236897621. The cubic root of 866349977 is about 953.3033578064.

The spelling of 866349977 in words is "eight hundred sixty-six million, three hundred forty-nine thousand, nine hundred seventy-seven".