66413215 has 16 divisors (see below), whose sum is σ = 87104160. Its totient is φ = 48209920.

The previous prime is 66413159. The next prime is 66413287. The reversal of 66413215 is 51231466.

It is not a de Polignac number, because 66413215 - 2²⁵ = 32858783 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 46431 + ... + 47839.

It is an arithmetic number, because the mean of its divisors is an integer number (5444010).

Almost surely, 2^66413215 is an apocalyptic number.

66413215 is a deficient number, since it is larger than the sum of its proper divisors (20690945).

66413215 is a wasteful number, since it uses less digits than its factorization.

66413215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282.

The product of its digits is 4320, while the sum is 28.

The square root of 66413215 is about 8149.4303481900. The cubic root of 66413215 is about 404.9656324035.

The spelling of 66413215 in words is "sixty-six million, four hundred thirteen thousand, two hundred fifteen".