66416161 has 16 divisors (see below), whose sum is σ = 81285120. Its totient is φ = 52968960.

The previous prime is 66416159. The next prime is 66416171. The reversal of 66416161 is 16161466.

It is a cyclic number.

It is not a de Polignac number, because 66416161 - 2¹ = 66416159 is a prime.

It is a super-2 number, since 2×66416161² = 8822212883955842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66416101) 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, 7456 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (5080320).

Almost surely, 2^66416161 is an apocalyptic number.

It is an amenable number.

66416161 is a deficient number, since it is larger than the sum of its proper divisors (14868959).

66416161 is a wasteful number, since it uses less digits than its factorization.

66416161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384.

The product of its digits is 5184, while the sum is 31.

The square root of 66416161 is about 8149.6110950155. The cubic root of 66416161 is about 404.9716202234.

The spelling of 66416161 in words is "sixty-six million, four hundred sixteen thousand, one hundred sixty-one".