1166400251 has 2 divisors, whose sum is σ = 1166400252. Its totient is φ = 1166400250.

The previous prime is 1166400233. The next prime is 1166400299. The reversal of 1166400251 is 1520046611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1166400251 - 2¹⁸ = 1166138107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1166400251.

It is not a weakly prime, because it can be changed into another prime (1166400751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583200125 + 583200126.

It is an arithmetic number, because the mean of its divisors is an integer number (583200126).

Almost surely, 2^1166400251 is an apocalyptic number.

1166400251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166400251 is an equidigital number, since it uses as much as digits as its factorization.

1166400251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1166400251 is about 34152.6024045021. The cubic root of 1166400251 is about 1052.6464612637.

Adding to 1166400251 its reverse (1520046611), we get a palindrome (2686446862).

The spelling of 1166400251 in words is "one billion, one hundred sixty-six million, four hundred thousand, two hundred fifty-one".