1166056555 has 4 divisors (see below), whose sum is σ = 1399267872. Its totient is φ = 932845240.

The previous prime is 1166056547. The next prime is 1166056559. The reversal of 1166056555 is 5556506611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1166056555 - 2³ = 1166056547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166056559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116605651 + ... + 116605660.

It is an arithmetic number, because the mean of its divisors is an integer number (349816968).

Almost surely, 2^1166056555 is an apocalyptic number.

1166056555 is a deficient number, since it is larger than the sum of its proper divisors (233211317).

1166056555 is an equidigital number, since it uses as much as digits as its factorization.

1166056555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233211316.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 1166056555 is about 34147.5702649544. The cubic root of 1166056555 is about 1052.5430588169.

It can be divided in two parts, 1166056 and 555, that added together give a palindrome (1166611).

The spelling of 1166056555 in words is "one billion, one hundred sixty-six million, fifty-six thousand, five hundred fifty-five".