66042165 has 16 divisors (see below), whose sum is σ = 120763008. Its totient is φ = 30190656.

The previous prime is 66042139. The next prime is 66042167. The reversal of 66042165 is 56124066.

It is not a de Polignac number, because 66042165 - 2⁵ = 66042133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042167) 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, 314382 + ... + 314591.

It is an arithmetic number, because the mean of its divisors is an integer number (7547688).

Almost surely, 2^66042165 is an apocalyptic number.

It is an amenable number.

66042165 is a deficient number, since it is larger than the sum of its proper divisors (54720843).

66042165 is a wasteful number, since it uses less digits than its factorization.

66042165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628988.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66042165 is about 8126.6330666519. The cubic root of 66042165 is about 404.2100437850.

The spelling of 66042165 in words is "sixty-six million, forty-two thousand, one hundred sixty-five".