166765555 has 16 divisors (see below), whose sum is σ = 218617344. Its totient is φ = 121114080.

The previous prime is 166765519. The next prime is 166765559. The reversal of 166765555 is 555567661.

It is not a de Polignac number, because 166765555 - 2¹⁹ = 166241267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166765559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48214 + ... + 51556.

It is an arithmetic number, because the mean of its divisors is an integer number (13663584).

Almost surely, 2^166765555 is an apocalyptic number.

166765555 is a deficient number, since it is larger than the sum of its proper divisors (51851789).

166765555 is a wasteful number, since it uses less digits than its factorization.

166765555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266.

The product of its digits is 945000, while the sum is 46.

The square root of 166765555 is about 12913.7738481050. The cubic root of 166765555 is about 550.4300273242.

The spelling of 166765555 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, five hundred fifty-five".