64666115 has 4 divisors (see below), whose sum is σ = 77599344. Its totient is φ = 51732888.

The previous prime is 64666099. The next prime is 64666127. The reversal of 64666115 is 51166646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64666115 - 2⁴ = 64666099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6466607 + ... + 6466616.

It is an arithmetic number, because the mean of its divisors is an integer number (19399836).

Almost surely, 2^64666115 is an apocalyptic number.

64666115 is a deficient number, since it is larger than the sum of its proper divisors (12933229).

64666115 is a wasteful number, since it uses less digits than its factorization.

64666115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12933228.

The product of its digits is 25920, while the sum is 35.

The square root of 64666115 is about 8041.5244201582. The cubic root of 64666115 is about 401.3829526777.

The spelling of 64666115 in words is "sixty-four million, six hundred sixty-six thousand, one hundred fifteen".