866550007 has 4 divisors (see below), whose sum is σ = 870948936. Its totient is φ = 862151080.

The previous prime is 866549977. The next prime is 866550011. The reversal of 866550007 is 700055668.

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 866550007 - 2¹¹ = 866547959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866550107) 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, 2199169 + ... + 2199562.

It is an arithmetic number, because the mean of its divisors is an integer number (217737234).

Almost surely, 2^866550007 is an apocalyptic number.

866550007 is a deficient number, since it is larger than the sum of its proper divisors (4398929).

866550007 is a wasteful number, since it uses less digits than its factorization.

866550007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4398928.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 866550007 is about 29437.2214551578. The cubic root of 866550007 is about 953.3767209974.

The spelling of 866550007 in words is "eight hundred sixty-six million, five hundred fifty thousand, seven".