866140605 has 24 divisors (see below), whose sum is σ = 1637794080. Its totient is φ = 419946720.

The previous prime is 866140579. The next prime is 866140619. The reversal of 866140605 is 506041668.

866140605 is a `hidden beast` number, since 8 + 6 + 6 + 1 + 40 + 605 = 666.

It is not a de Polignac number, because 866140605 - 2⁸ = 866140349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866140605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 874395 + ... + 875384.

It is an arithmetic number, because the mean of its divisors is an integer number (68241420).

Almost surely, 2^866140605 is an apocalyptic number.

It is an amenable number.

866140605 is a deficient number, since it is larger than the sum of its proper divisors (771653475).

866140605 is a wasteful number, since it uses less digits than its factorization.

866140605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749801 (or 1749798 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 866140605 is about 29430.2668183624. The cubic root of 866140605 is about 953.2265562378.

The spelling of 866140605 in words is "eight hundred sixty-six million, one hundred forty thousand, six hundred five".