866257461 has 6 divisors (see below), whose sum is σ = 1251260790. Its totient is φ = 577504968.

The previous prime is 866257451. The next prime is 866257499. The reversal of 866257461 is 164752668.

866257461 is a `hidden beast` number, since 86 + 62 + 57 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 684816561 + 181440900 = 26169^2 + 13470^2 .

It is not a de Polignac number, because 866257461 - 2⁷ = 866257333 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866257421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48125406 + ... + 48125423.

It is an arithmetic number, because the mean of its divisors is an integer number (208543465).

Almost surely, 2^866257461 is an apocalyptic number.

It is an amenable number.

866257461 is a deficient number, since it is larger than the sum of its proper divisors (385003329).

866257461 is a wasteful number, since it uses less digits than its factorization.

866257461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96250835 (or 96250832 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 866257461 is about 29432.2520545065. The cubic root of 866257461 is about 953.2694227318.

The spelling of 866257461 in words is "eight hundred sixty-six million, two hundred fifty-seven thousand, four hundred sixty-one".