1166525161 has 4 divisors (see below), whose sum is σ = 1177850752. Its totient is φ = 1155199572.

The previous prime is 1166525147. The next prime is 1166525183. The reversal of 1166525161 is 1615256611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1615256611 = 12301 ⋅131311.

It is a cyclic number.

It is not a de Polignac number, because 1166525161 - 2²⁷ = 1032307433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166525111) 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, 5662641 + ... + 5662846.

It is an arithmetic number, because the mean of its divisors is an integer number (294462688).

Almost surely, 2^1166525161 is an apocalyptic number.

It is an amenable number.

1166525161 is a deficient number, since it is larger than the sum of its proper divisors (11325591).

1166525161 is a wasteful number, since it uses less digits than its factorization.

1166525161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11325590.

The product of its digits is 10800, while the sum is 34.

The square root of 1166525161 is about 34154.4310595273. The cubic root of 1166525161 is about 1052.6840359516.

The spelling of 1166525161 in words is "one billion, one hundred sixty-six million, five hundred twenty-five thousand, one hundred sixty-one".