66240615 has 16 divisors (see below), whose sum is σ = 121125888. Its totient is φ = 30281376.

The previous prime is 66240613. The next prime is 66240673. The reversal of 66240615 is 51604266.

It is not a de Polignac number, because 66240615 - 2¹ = 66240613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240613) 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, 315327 + ... + 315536.

It is an arithmetic number, because the mean of its divisors is an integer number (7570368).

Almost surely, 2^66240615 is an apocalyptic number.

66240615 is a deficient number, since it is larger than the sum of its proper divisors (54885273).

66240615 is a wasteful number, since it uses less digits than its factorization.

66240615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630878.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66240615 is about 8138.8337616639. The cubic root of 66240615 is about 404.6145089757.

The spelling of 66240615 in words is "sixty-six million, two hundred forty thousand, six hundred fifteen".