66242755657 has 16 divisors (see below), whose sum is σ = 72333818368. Its totient is φ = 60294326400.

The previous prime is 66242755633. The next prime is 66242755687. The reversal of 66242755657 is 75655724266.

It is a cyclic number.

It is not a de Polignac number, because 66242755657 - 2⁷ = 66242755529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66242755598 and 66242755607.

It is not an unprimeable number, because it can be changed into a prime (66242755687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5729032 + ... + 5740582.

It is an arithmetic number, because the mean of its divisors is an integer number (4520863648).

Almost surely, 2^66242755657 is an apocalyptic number.

It is an amenable number.

66242755657 is a deficient number, since it is larger than the sum of its proper divisors (6091062711).

66242755657 is a wasteful number, since it uses less digits than its factorization.

66242755657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17680.

The product of its digits is 21168000, while the sum is 55.

The spelling of 66242755657 in words is "sixty-six billion, two hundred forty-two million, seven hundred fifty-five thousand, six hundred fifty-seven".