166520055 has 16 divisors (see below), whose sum is σ = 286927200. Its totient is φ = 81979008.

The previous prime is 166520051. The next prime is 166520087. The reversal of 166520055 is 550025661.

It is not a de Polignac number, because 166520055 - 2² = 166520051 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166520051) 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, 426780 + ... + 427169.

It is an arithmetic number, because the mean of its divisors is an integer number (17932950).

Almost surely, 2^166520055 is an apocalyptic number.

166520055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166520055 is a deficient number, since it is larger than the sum of its proper divisors (120407145).

166520055 is a wasteful number, since it uses less digits than its factorization.

166520055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853970.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 166520055 is about 12904.2649926294. The cubic root of 166520055 is about 550.1597937903.

The spelling of 166520055 in words is "one hundred sixty-six million, five hundred twenty thousand, fifty-five".