66252215 has 4 divisors (see below), whose sum is σ = 79502664. Its totient is φ = 53001768.

The previous prime is 66252209. The next prime is 66252227. The reversal of 66252215 is 51225266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51225266 = 2 ⋅25612633.

It is a cyclic number.

It is not a de Polignac number, because 66252215 - 2¹⁰ = 66251191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6625217 + ... + 6625226.

It is an arithmetic number, because the mean of its divisors is an integer number (19875666).

Almost surely, 2^66252215 is an apocalyptic number.

66252215 is a deficient number, since it is larger than the sum of its proper divisors (13250449).

66252215 is a wasteful number, since it uses less digits than its factorization.

66252215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13250448.

The product of its digits is 7200, while the sum is 29.

The square root of 66252215 is about 8139.5463632809. The cubic root of 66252215 is about 404.6381261798.

The spelling of 66252215 in words is "sixty-six million, two hundred fifty-two thousand, two hundred fifteen".