86666915 has 4 divisors (see below), whose sum is σ = 104000304. Its totient is φ = 69333528.

The previous prime is 86666911. The next prime is 86666939. The reversal of 86666915 is 51966668.

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 86666915 - 2² = 86666911 is a prime.

It is a super-2 number, since 2×86666915² = 15022308311234450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86666915.

It is not an unprimeable number, because it can be changed into a prime (86666911) 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, 8666687 + ... + 8666696.

It is an arithmetic number, because the mean of its divisors is an integer number (26000076).

Almost surely, 2^86666915 is an apocalyptic number.

86666915 is a deficient number, since it is larger than the sum of its proper divisors (17333389).

86666915 is a wasteful number, since it uses less digits than its factorization.

86666915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17333388.

The product of its digits is 466560, while the sum is 47.

The square root of 86666915 is about 9309.5067001426. The cubic root of 86666915 is about 442.5385541008.

The spelling of 86666915 in words is "eighty-six million, six hundred sixty-six thousand, nine hundred fifteen".