1166400255 has 16 divisors (see below), whose sum is σ = 1878603264. Its totient is φ = 617959200.

The previous prime is 1166400251. The next prime is 1166400299. The reversal of 1166400255 is 5520046611.

It is not a de Polignac number, because 1166400255 - 2² = 1166400251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166400251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255219 + ... + 259748.

It is an arithmetic number, because the mean of its divisors is an integer number (117412704).

Almost surely, 2^1166400255 is an apocalyptic number.

1166400255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1166400255 is a deficient number, since it is larger than the sum of its proper divisors (712203009).

1166400255 is a wasteful number, since it uses less digits than its factorization.

1166400255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515126.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1166400255 is about 34152.6024630628. The cubic root of 1166400255 is about 1052.6464624670.

Adding to 1166400255 its reverse (5520046611), we get a palindrome (6686446866).

The spelling of 1166400255 in words is "one billion, one hundred sixty-six million, four hundred thousand, two hundred fifty-five".