866553139 has 8 divisors (see below), whose sum is σ = 870743808. Its totient is φ = 862370880.

The previous prime is 866553113. The next prime is 866553169. The reversal of 866553139 is 931355668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866553139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866553109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304029 + ... + 306865.

It is an arithmetic number, because the mean of its divisors is an integer number (108842976).

Almost surely, 2^866553139 is an apocalyptic number.

866553139 is a deficient number, since it is larger than the sum of its proper divisors (4190669).

866553139 is a wasteful number, since it uses less digits than its factorization.

866553139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4205.

The product of its digits is 583200, while the sum is 46.

The square root of 866553139 is about 29437.2746530653. The cubic root of 866553139 is about 953.3778696029.

The spelling of 866553139 in words is "eight hundred sixty-six million, five hundred fifty-three thousand, one hundred thirty-nine".