1161163566 has 32 divisors (see below), whose sum is σ = 2591758080. Its totient is φ = 385345368.

The previous prime is 1161163537. The next prime is 1161163571. The reversal of 1161163566 is 6653611611.

1161163566 is a `hidden beast` number, since 1 + 1 + 6 + 11 + 635 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1161163566.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 35106 + ... + 59621.

It is an arithmetic number, because the mean of its divisors is an integer number (80992440).

Almost surely, 2^1161163566 is an apocalyptic number.

1161163566 is an abundant number, since it is smaller than the sum of its proper divisors (1430594514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161163566 is a wasteful number, since it uses less digits than its factorization.

1161163566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94965 (or 94959 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 1161163566 is about 34075.8501874862. The cubic root of 1161163566 is about 1051.0687729738.

The spelling of 1161163566 in words is "one billion, one hundred sixty-one million, one hundred sixty-three thousand, five hundred sixty-six".