66242615 has 4 divisors (see below), whose sum is σ = 79491144. Its totient is φ = 52994088.

The previous prime is 66242597. The next prime is 66242669. The reversal of 66242615 is 51624266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51624266 = 2 ⋅25812133.

It is a cyclic number.

It is not a de Polignac number, because 66242615 - 2⁶ = 66242551 is a prime.

It is a Duffinian number.

It is a congruent 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, 6624257 + ... + 6624266.

It is an arithmetic number, because the mean of its divisors is an integer number (19872786).

Almost surely, 2^66242615 is an apocalyptic number.

66242615 is a deficient number, since it is larger than the sum of its proper divisors (13248529).

66242615 is a wasteful number, since it uses less digits than its factorization.

66242615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248528.

The product of its digits is 17280, while the sum is 32.

The square root of 66242615 is about 8138.9566284629. The cubic root of 66242615 is about 404.6185811042.

It can be divided in two parts, 6624261 and 5, that added together give a palindrome (6624266).

The spelling of 66242615 in words is "sixty-six million, two hundred forty-two thousand, six hundred fifteen".