66418315 has 4 divisors (see below), whose sum is σ = 79701984. Its totient is φ = 53134648.

The previous prime is 66418291. The next prime is 66418327. The reversal of 66418315 is 51381466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51381466 = 2 ⋅25690733.

It is a cyclic number.

It is not a de Polignac number, because 66418315 - 2¹⁵ = 66385547 is a prime.

It is a super-2 number, since 2×66418315² = 8822785134878450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641827 + ... + 6641836.

It is an arithmetic number, because the mean of its divisors is an integer number (19925496).

Almost surely, 2^66418315 is an apocalyptic number.

66418315 is a deficient number, since it is larger than the sum of its proper divisors (13283669).

66418315 is a wasteful number, since it uses less digits than its factorization.

66418315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13283668.

The product of its digits is 17280, while the sum is 34.

The square root of 66418315 is about 8149.7432474895. The cubic root of 66418315 is about 404.9759981711.

The spelling of 66418315 in words is "sixty-six million, four hundred eighteen thousand, three hundred fifteen".