66228272857 has 2 divisors, whose sum is σ = 66228272858. Its totient is φ = 66228272856.

The previous prime is 66228272837. The next prime is 66228272879. The reversal of 66228272857 is 75827282266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64904695696 + 1323577161 = 254764^2 + 36381^2 .

It is a cyclic number.

It is not a de Polignac number, because 66228272857 - 2¹¹ = 66228270809 is a prime.

It is a super-4 number, since 4×66228272857⁴ (a number of 44 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66228272798 and 66228272807.

It is not a weakly prime, because it can be changed into another prime (66228272827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33114136428 + 33114136429.

It is an arithmetic number, because the mean of its divisors is an integer number (33114136429).

Almost surely, 2^66228272857 is an apocalyptic number.

It is an amenable number.

66228272857 is a deficient number, since it is larger than the sum of its proper divisors (1).

66228272857 is an equidigital number, since it uses as much as digits as its factorization.

66228272857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 55.

The spelling of 66228272857 in words is "sixty-six billion, two hundred twenty-eight million, two hundred seventy-two thousand, eight hundred fifty-seven".