1166507857 has 4 divisors (see below), whose sum is σ = 1177833280. Its totient is φ = 1155182436.

The previous prime is 1166507791. The next prime is 1166507893. The reversal of 1166507857 is 7587056611.

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 a de Polignac number, because none of the positive numbers 2^k-1166507857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166507257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5662557 + ... + 5662762.

It is an arithmetic number, because the mean of its divisors is an integer number (294458320).

Almost surely, 2^1166507857 is an apocalyptic number.

It is an amenable number.

1166507857 is a deficient number, since it is larger than the sum of its proper divisors (11325423).

1166507857 is a wasteful number, since it uses less digits than its factorization.

1166507857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11325422.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 1166507857 is about 34154.1777386018. The cubic root of 1166507857 is about 1052.6788308246.

The spelling of 1166507857 in words is "one billion, one hundred sixty-six million, five hundred seven thousand, eight hundred fifty-seven".