66624242665 has 16 divisors (see below), whose sum is σ = 81087025536. Its totient is φ = 52540992000.

The previous prime is 66624242603. The next prime is 66624242681. The reversal of 66624242665 is 56624242666.

It is not a de Polignac number, because 66624242665 - 2¹⁹ = 66623718377 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 4412569 + ... + 4427641.

It is an arithmetic number, because the mean of its divisors is an integer number (5067939096).

Almost surely, 2^66624242665 is an apocalyptic number.

It is an amenable number.

66624242665 is a deficient number, since it is larger than the sum of its proper divisors (14462782871).

66624242665 is a wasteful number, since it uses less digits than its factorization.

66624242665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27600.

The product of its digits is 4976640, while the sum is 49.

Subtracting from 66624242665 its reverse (56624242666), we obtain a palindrome (9999999999).

The spelling of 66624242665 in words is "sixty-six billion, six hundred twenty-four million, two hundred forty-two thousand, six hundred sixty-five".