66624242667 has 16 divisors (see below), whose sum is σ = 90213108480. Its totient is φ = 43730684000.

The previous prime is 66624242603. The next prime is 66624242681. The reversal of 66624242667 is 76624242666.

It is a cyclic number.

It is not a de Polignac number, because 66624242667 - 2⁶ = 66624242603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66624242467) 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, 559959 + ... + 668432.

It is an arithmetic number, because the mean of its divisors is an integer number (5638319280).

Almost surely, 2^66624242667 is an apocalyptic number.

66624242667 is a deficient number, since it is larger than the sum of its proper divisors (23588865813).

66624242667 is a wasteful number, since it uses less digits than its factorization.

66624242667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228674.

The product of its digits is 6967296, while the sum is 51.

Subtracting 66624242667 from its reverse (76624242666), we obtain a palindrome (9999999999).

It can be divided in two parts, 66624 and 242667, that added together give a triangular number (309291 = T₇₈₆).

The spelling of 66624242667 in words is "sixty-six billion, six hundred twenty-four million, two hundred forty-two thousand, six hundred sixty-seven".