85566977 has 4 divisors (see below), whose sum is σ = 87879636. Its totient is φ = 83254320.

The previous prime is 85566953. The next prime is 85566979. The reversal of 85566977 is 77966558.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45104656 + 40462321 = 6716^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 85566977 - 2⁸ = 85566721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85566979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156274 + ... + 1156347.

It is an arithmetic number, because the mean of its divisors is an integer number (21969909).

Almost surely, 2^85566977 is an apocalyptic number.

It is an amenable number.

85566977 is a deficient number, since it is larger than the sum of its proper divisors (2312659).

85566977 is a wasteful number, since it uses less digits than its factorization.

85566977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312658.

The product of its digits is 3175200, while the sum is 53.

The square root of 85566977 is about 9250.2419968345. The cubic root of 85566977 is about 440.6584099342.

The spelling of 85566977 in words is "eighty-five million, five hundred sixty-six thousand, nine hundred seventy-seven".