66416417 has 4 divisors (see below), whose sum is σ = 66701700. Its totient is φ = 66131136.

The previous prime is 66416407. The next prime is 66416423. The reversal of 66416417 is 71461466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71461466 = 2 ⋅35730733.

It can be written as a sum of positive squares in 2 ways, for example, as 42981136 + 23435281 = 6556^2 + 4841^2 .

It is a cyclic number.

It is not a de Polignac number, because 66416417 - 2¹² = 66412321 is a prime.

It is a super-2 number, since 2×66416417² = 8822280894235778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66416407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142292 + ... + 142757.

It is an arithmetic number, because the mean of its divisors is an integer number (16675425).

Almost surely, 2^66416417 is an apocalyptic number.

It is an amenable number.

66416417 is a deficient number, since it is larger than the sum of its proper divisors (285283).

66416417 is a wasteful number, since it uses less digits than its factorization.

66416417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285282.

The product of its digits is 24192, while the sum is 35.

The square root of 66416417 is about 8149.6268012713. The cubic root of 66416417 is about 404.9721405416.

The spelling of 66416417 in words is "sixty-six million, four hundred sixteen thousand, four hundred seventeen".