66475427657 has 2 divisors, whose sum is σ = 66475427658. Its totient is φ = 66475427656.

The previous prime is 66475427633. The next prime is 66475427717. The reversal of 66475427657 is 75672457466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45274902841 + 21200524816 = 212779^2 + 145604^2 .

It is a cyclic number.

It is not a de Polignac number, because 66475427657 - 2³² = 62180460361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66475427596 and 66475427605.

It is not a weakly prime, because it can be changed into another prime (66475423657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33237713828 + 33237713829.

It is an arithmetic number, because the mean of its divisors is an integer number (33237713829).

Almost surely, 2^66475427657 is an apocalyptic number.

It is an amenable number.

66475427657 is a deficient number, since it is larger than the sum of its proper divisors (1).

66475427657 is an equidigital number, since it uses as much as digits as its factorization.

66475427657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59270400, while the sum is 59.

The spelling of 66475427657 in words is "sixty-six billion, four hundred seventy-five million, four hundred twenty-seven thousand, six hundred fifty-seven".