1166399859 has 8 divisors (see below), whose sum is σ = 1555497360. Its totient is φ = 777451136.

The previous prime is 1166399837. The next prime is 1166399867. The reversal of 1166399859 is 9589936611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1166399859 - 2⁹ = 1166399347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1166399799 and 1166399808.

It is not an unprimeable number, because it can be changed into a prime (1166399959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17394 + ... + 51335.

It is an arithmetic number, because the mean of its divisors is an integer number (194437170).

Almost surely, 2^1166399859 is an apocalyptic number.

1166399859 is a deficient number, since it is larger than the sum of its proper divisors (389097501).

1166399859 is an equidigital number, since it uses as much as digits as its factorization.

1166399859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74389.

The product of its digits is 3149280, while the sum is 57.

The square root of 1166399859 is about 34152.5966655539. The cubic root of 1166399859 is about 1052.6463433403.

The spelling of 1166399859 in words is "one billion, one hundred sixty-six million, three hundred ninety-nine thousand, eight hundred fifty-nine".