866275542 has 72 divisors (see below), whose sum is σ = 2152895472. Its totient is φ = 251079840.

The previous prime is 866275507. The next prime is 866275573. The reversal of 866275542 is 245572668.

866275542 is a `hidden beast` number, since 86 + 6 + 27 + 5 + 542 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 41448 + ... + 58740.

It is an arithmetic number, because the mean of its divisors is an integer number (29901326).

Almost surely, 2^866275542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866275542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076447736).

866275542 is an abundant number, since it is smaller than the sum of its proper divisors (1286619930).

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

866275542 is a wasteful number, since it uses less digits than its factorization.

866275542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17346 (or 17332 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 866275542 is about 29432.5592159431. The cubic root of 866275542 is about 953.2760550728.

The spelling of 866275542 in words is "eight hundred sixty-six million, two hundred seventy-five thousand, five hundred forty-two".