866151087 has 4 divisors (see below), whose sum is σ = 1154868120. Its totient is φ = 577434056.

The previous prime is 866151047. The next prime is 866151103. The reversal of 866151087 is 780151668.

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 866151087 - 2¹⁹ = 865626799 is a prime.

It is a super-2 number, since 2×866151087² = 1500435411022563138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866151047) 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, 144358512 + ... + 144358517.

It is an arithmetic number, because the mean of its divisors is an integer number (288717030).

Almost surely, 2^866151087 is an apocalyptic number.

866151087 is a deficient number, since it is larger than the sum of its proper divisors (288717033).

866151087 is a wasteful number, since it uses less digits than its factorization.

866151087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288717032.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 866151087 is about 29430.4448997972. Note that the first 3 decimals coincide. The cubic root of 866151087 is about 953.2304015258.

The spelling of 866151087 in words is "eight hundred sixty-six million, one hundred fifty-one thousand, eighty-seven".