66994165 has 16 divisors (see below), whose sum is σ = 93386880. Its totient is φ = 45184320.

The previous prime is 66994163. The next prime is 66994177. The reversal of 66994165 is 56149966.

It is not a de Polignac number, because 66994165 - 2¹ = 66994163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66994163) 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, 13555 + ... + 17824.

It is an arithmetic number, because the mean of its divisors is an integer number (5836680).

Almost surely, 2^66994165 is an apocalyptic number.

It is an amenable number.

66994165 is a deficient number, since it is larger than the sum of its proper divisors (26392715).

66994165 is a wasteful number, since it uses less digits than its factorization.

66994165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31452.

The product of its digits is 349920, while the sum is 46.

The square root of 66994165 is about 8184.9963347579. The cubic root of 66994165 is about 406.1430190888.

The spelling of 66994165 in words is "sixty-six million, nine hundred ninety-four thousand, one hundred sixty-five".