66242124257 has 16 divisors (see below), whose sum is σ = 69982852608. Its totient is φ = 62577123840.

The previous prime is 66242124233. The next prime is 66242124283. The reversal of 66242124257 is 75242124266.

It is a cyclic number.

It is not a de Polignac number, because 66242124257 - 2¹⁶ = 66242058721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66242124757) 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, 684968 + ... + 775670.

It is an arithmetic number, because the mean of its divisors is an integer number (4373928288).

Almost surely, 2^66242124257 is an apocalyptic number.

It is an amenable number.

66242124257 is a deficient number, since it is larger than the sum of its proper divisors (3740728351).

66242124257 is a wasteful number, since it uses less digits than its factorization.

66242124257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91120.

The product of its digits is 322560, while the sum is 41.

Subtracting 66242124257 from its reverse (75242124266), we obtain a palindrome (9000000009).

The spelling of 66242124257 in words is "sixty-six billion, two hundred forty-two million, one hundred twenty-four thousand, two hundred fifty-seven".