866772666 has 24 divisors (see below), whose sum is σ = 1976850720. Its totient is φ = 273717576.

The previous prime is 866772631. The next prime is 866772667. The reversal of 866772666 is 666277668.

It is not an unprimeable number, because it can be changed into a prime (866772667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266870 + ... + 1267553.

It is an arithmetic number, because the mean of its divisors is an integer number (82368780).

Almost surely, 2^866772666 is an apocalyptic number.

866772666 is an abundant number, since it is smaller than the sum of its proper divisors (1110078054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866772666 is a wasteful number, since it uses less digits than its factorization.

866772666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534450 (or 2534447 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The square root of 866772666 is about 29441.0031418768. The cubic root of 866772666 is about 953.4583703451.

The spelling of 866772666 in words is "eight hundred sixty-six million, seven hundred seventy-two thousand, six hundred sixty-six".