1166816259 has 56 divisors (see below), whose sum is σ = 2015142240. Its totient is φ = 661488768.

The previous prime is 1166816257. The next prime is 1166816269. The reversal of 1166816259 is 9526186611.

1166816259 is a `hidden beast` number, since 1 + 16 + 6 + 8 + 1 + 625 + 9 = 666.

It is not a de Polignac number, because 1166816259 - 2¹ = 1166816257 is a prime.

It is a super-2 number, since 2×1166816259² = 2722920364533510162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1166816257) 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 55 ways as a sum of consecutive naturals, for example, 698277 + ... + 699945.

Almost surely, 2^1166816259 is an apocalyptic number.

1166816259 is a deficient number, since it is larger than the sum of its proper divisors (848325981).

1166816259 is an equidigital number, since it uses as much as digits as its factorization.

1166816259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1816 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1166816259 is about 34158.6922905430. The cubic root of 1166816259 is about 1052.7715919231.

The spelling of 1166816259 in words is "one billion, one hundred sixty-six million, eight hundred sixteen thousand, two hundred fifty-nine".