2166158775 has 48 divisors (see below), whose sum is σ = 3912249600. Its totient is φ = 1048838400.

The previous prime is 2166158773. The next prime is 2166158803. The reversal of 2166158775 is 5778516612.

It is not a de Polignac number, because 2166158775 - 2¹ = 2166158773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166158773) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 864174 + ... + 866676.

It is an arithmetic number, because the mean of its divisors is an integer number (81505200).

Almost surely, 2^2166158775 is an apocalyptic number.

2166158775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2166158775 is a deficient number, since it is larger than the sum of its proper divisors (1746090825).

2166158775 is a wasteful number, since it uses less digits than its factorization.

2166158775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3571 counting only the distinct ones).

The product of its digits is 705600, while the sum is 48.

The square root of 2166158775 is about 46542.0108611564. The cubic root of 2166158775 is about 1293.8882295302. Note that the first 3 decimals are identical.

The spelling of 2166158775 in words is "two billion, one hundred sixty-six million, one hundred fifty-eight thousand, seven hundred seventy-five".