866555442 has 32 divisors (see below), whose sum is σ = 1947326400. Its totient is φ = 285604704.

The previous prime is 866555381. The next prime is 866555449. The reversal of 866555442 is 244555668.

866555442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (866555449) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85348 + ... + 94959.

It is an arithmetic number, because the mean of its divisors is an integer number (60853950).

Almost surely, 2^866555442 is an apocalyptic number.

866555442 is an abundant number, since it is smaller than the sum of its proper divisors (1080770958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866555442 is a wasteful number, since it uses less digits than its factorization.

866555442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180407 (or 180401 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The square root of 866555442 is about 29437.3137701116. The cubic root of 866555442 is about 953.3787141855.

The spelling of 866555442 in words is "eight hundred sixty-six million, five hundred fifty-five thousand, four hundred forty-two".