66566647157 has 2 divisors, whose sum is σ = 66566647158. Its totient is φ = 66566647156.

The previous prime is 66566647141. The next prime is 66566647207. The reversal of 66566647157 is 75174666566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62800861201 + 3765785956 = 250601^2 + 61366^2 .

It is a cyclic number.

It is not a de Polignac number, because 66566647157 - 2⁴ = 66566647141 is a prime.

It is a super-2 number, since 2×66566647157² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66566647096 and 66566647105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66566647657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283323578 + 33283323579.

It is an arithmetic number, because the mean of its divisors is an integer number (33283323579).

Almost surely, 2^66566647157 is an apocalyptic number.

It is an amenable number.

66566647157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566647157 is an equidigital number, since it uses as much as digits as its factorization.

66566647157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 59.

The spelling of 66566647157 in words is "sixty-six billion, five hundred sixty-six million, six hundred forty-seven thousand, one hundred fifty-seven".