1166287257 has 12 divisors (see below), whose sum is σ = 1691688960. Its totient is φ = 774270168.

The previous prime is 1166287181. The next prime is 1166287273. The reversal of 1166287257 is 7527826611.

1166287257 is a `hidden beast` number, since 1 + 16 + 628 + 7 + 2 + 5 + 7 = 666.

It is not a de Polignac number, because 1166287257 - 2²⁰ = 1165238681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166287457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268953 + ... + 273254.

It is an arithmetic number, because the mean of its divisors is an integer number (140974080).

Almost surely, 2^1166287257 is an apocalyptic number.

It is an amenable number.

1166287257 is a deficient number, since it is larger than the sum of its proper divisors (525401703).

1166287257 is a wasteful number, since it uses less digits than its factorization.

1166287257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542452 (or 542449 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1166287257 is about 34150.9481127538. The cubic root of 1166287257 is about 1052.6124687655.

The spelling of 1166287257 in words is "one billion, one hundred sixty-six million, two hundred eighty-seven thousand, two hundred fifty-seven".