1161055566 has 32 divisors (see below), whose sum is σ = 2814681600. Its totient is φ = 351834840.

The previous prime is 1161055559. The next prime is 1161055619. The reversal of 1161055566 is 6655501611.

It is a super-3 number, since 3×1161055566³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1161055566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976726 + ... + 977913.

It is an arithmetic number, because the mean of its divisors is an integer number (87958800).

Almost surely, 2^1161055566 is an apocalyptic number.

1161055566 is an abundant number, since it is smaller than the sum of its proper divisors (1653626034).

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

1161055566 is a wasteful number, since it uses less digits than its factorization.

1161055566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954661 (or 1954655 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1161055566 is about 34074.2654506300. The cubic root of 1161055566 is about 1051.0361852746.

It can be divided in two parts, 11610 and 55566, that added together give a palindrome (67176).

The spelling of 1161055566 in words is "one billion, one hundred sixty-one million, fifty-five thousand, five hundred sixty-six".