866066231 has 4 divisors (see below), whose sum is σ = 866781432. Its totient is φ = 865351032.

The previous prime is 866066221. The next prime is 866066263. The reversal of 866066231 is 132660668.

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

It is a cyclic number.

It is not a de Polignac number, because 866066231 - 2¹⁸ = 865804087 is a prime.

It is a super-2 number, since 2×866066231² = 1500141432957090722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866066221) 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, 355781 + ... + 358206.

It is an arithmetic number, because the mean of its divisors is an integer number (216695358).

Almost surely, 2^866066231 is an apocalyptic number.

866066231 is a deficient number, since it is larger than the sum of its proper divisors (715201).

866066231 is a wasteful number, since it uses less digits than its factorization.

866066231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715200.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 866066231 is about 29429.0032281082. The cubic root of 866066231 is about 953.1992714833.

The spelling of 866066231 in words is "eight hundred sixty-six million, sixty-six thousand, two hundred thirty-one".