866255761 has 16 divisors (see below), whose sum is σ = 1011616000. Its totient is φ = 741472704.

The previous prime is 866255699. The next prime is 866255773. The reversal of 866255761 is 167552668.

It is not a de Polignac number, because 866255761 - 2⁹ = 866255249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866855761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344836 + ... + 347338.

It is an arithmetic number, because the mean of its divisors is an integer number (63226000).

Almost surely, 2^866255761 is an apocalyptic number.

It is an amenable number.

866255761 is a deficient number, since it is larger than the sum of its proper divisors (145360239).

866255761 is a wasteful number, since it uses less digits than its factorization.

866255761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533 (or 3519 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 866255761 is about 29432.2231746092. The cubic root of 866255761 is about 953.2687991455.

The spelling of 866255761 in words is "eight hundred sixty-six million, two hundred fifty-five thousand, seven hundred sixty-one".