66166055 has 16 divisors (see below), whose sum is σ = 83911680. Its totient is φ = 49983648.

The previous prime is 66166049. The next prime is 66166069. The reversal of 66166055 is 55066166.

It is a cyclic number.

It is not a de Polignac number, because 66166055 - 2⁴ = 66166039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5444 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (5244480).

Almost surely, 2^66166055 is an apocalyptic number.

66166055 is a deficient number, since it is larger than the sum of its proper divisors (17745625).

66166055 is a wasteful number, since it uses less digits than its factorization.

66166055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 66166055 is about 8134.2519631494. The cubic root of 66166055 is about 404.4626415056.

The spelling of 66166055 in words is "sixty-six million, one hundred sixty-six thousand, fifty-five".