1161166556 has 48 divisors (see below), whose sum is σ = 2240784000. Its totient is φ = 522123840.

The previous prime is 1161166553. The next prime is 1161166561. The reversal of 1161166556 is 6556611611.

It is a super-2 number, since 2×1161166556² = 2696615541545802272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161166553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2984810 + ... + 2985198.

It is an arithmetic number, because the mean of its divisors is an integer number (46683000).

Almost surely, 2^1161166556 is an apocalyptic number.

It is an amenable number.

1161166556 is a deficient number, since it is larger than the sum of its proper divisors (1079617444).

1161166556 is a wasteful number, since it uses less digits than its factorization.

1161166556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962 (or 960 counting only the distinct ones).

The product of its digits is 32400, while the sum is 38.

The square root of 1161166556 is about 34075.8940601710. The cubic root of 1161166556 is about 1051.0696751415.

The spelling of 1161166556 in words is "one billion, one hundred sixty-one million, one hundred sixty-six thousand, five hundred fifty-six".