866090915 has 4 divisors (see below), whose sum is σ = 1039309104. Its totient is φ = 692872728.

The previous prime is 866090903. The next prime is 866090923. The reversal of 866090915 is 519090668.

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 866090915 - 2¹⁰ = 866089891 is a prime.

It is a super-2 number, since 2×866090915² = 1500226946091074450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86609087 + ... + 86609096.

It is an arithmetic number, because the mean of its divisors is an integer number (259827276).

Almost surely, 2^866090915 is an apocalyptic number.

866090915 is a deficient number, since it is larger than the sum of its proper divisors (173218189).

866090915 is a wasteful number, since it uses less digits than its factorization.

866090915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173218188.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 866090915 is about 29429.4226073160. The cubic root of 866090915 is about 953.2083271984.

The spelling of 866090915 in words is "eight hundred sixty-six million, ninety thousand, nine hundred fifteen".