866251057 has 24 divisors (see below), whose sum is σ = 1028351592. Its totient is φ = 727372800.

The previous prime is 866251051. The next prime is 866251079. The reversal of 866251057 is 750152668.

866251057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4769856 + 861481201 = 2184^2 + 29351^2 .

It is not a de Polignac number, because 866251057 - 2²⁷ = 732033329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866251051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1054707 + ... + 1055527.

It is an arithmetic number, because the mean of its divisors is an integer number (42847983).

Almost surely, 2^866251057 is an apocalyptic number.

It is an amenable number.

866251057 is a deficient number, since it is larger than the sum of its proper divisors (162100535).

866251057 is a wasteful number, since it uses less digits than its factorization.

866251057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 866251057 is about 29432.1432620868. The cubic root of 866251057 is about 953.2670736410.

The spelling of 866251057 in words is "eight hundred sixty-six million, two hundred fifty-one thousand, fifty-seven".