66666315 has 16 divisors (see below), whose sum is σ = 108679968. Its totient is φ = 34884096.

The previous prime is 66666311. The next prime is 66666317. The reversal of 66666315 is 51366666.

It is not a de Polignac number, because 66666315 - 2² = 66666311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66666311) 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, 41134 + ... + 42723.

It is an arithmetic number, because the mean of its divisors is an integer number (6792498).

Almost surely, 2^66666315 is an apocalyptic number.

66666315 is a deficient number, since it is larger than the sum of its proper divisors (42013653).

66666315 is a wasteful number, since it uses less digits than its factorization.

66666315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83918.

The product of its digits is 116640, while the sum is 39.

The square root of 66666315 is about 8164.9442741515. The cubic root of 66666315 is about 405.4794200677.

The spelling of 66666315 in words is "sixty-six million, six hundred sixty-six thousand, three hundred fifteen".