1166863389 has 4 divisors (see below), whose sum is σ = 1555817856. Its totient is φ = 777908924.

The previous prime is 1166863367. The next prime is 1166863429. The reversal of 1166863389 is 9833686611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1166863389 - 2⁷ = 1166863261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166863189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194477229 + ... + 194477234.

It is an arithmetic number, because the mean of its divisors is an integer number (388954464).

Almost surely, 2^1166863389 is an apocalyptic number.

It is an amenable number.

1166863389 is a deficient number, since it is larger than the sum of its proper divisors (388954467).

1166863389 is an equidigital number, since it uses as much as digits as its factorization.

1166863389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388954466.

The product of its digits is 1119744, while the sum is 51.

The square root of 1166863389 is about 34159.3821519067. The cubic root of 1166863389 is about 1052.7857662363.

It can be divided in two parts, 11668 and 63389, that added together give a palindrome (75057).

The spelling of 1166863389 in words is "one billion, one hundred sixty-six million, eight hundred sixty-three thousand, three hundred eighty-nine".