166355554 has 4 divisors (see below), whose sum is σ = 249533334. Its totient is φ = 83177776.

The previous prime is 166355543. The next prime is 166355561. The reversal of 166355554 is 455553661.

166355554 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 166281025 + 74529 = 12895^2 + 273^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41588887 + ... + 41588890.

Almost surely, 2^166355554 is an apocalyptic number.

166355554 is a deficient number, since it is larger than the sum of its proper divisors (83177780).

166355554 is an equidigital number, since it uses as much as digits as its factorization.

166355554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83177779.

The product of its digits is 270000, while the sum is 40.

The square root of 166355554 is about 12897.8895172815. The cubic root of 166355554 is about 549.9785710659.

The spelling of 166355554 in words is "one hundred sixty-six million, three hundred fifty-five thousand, five hundred fifty-four".