66257255275243 has 2 divisors, whose sum is σ = 66257255275244. Its totient is φ = 66257255275242.

The previous prime is 66257255275231. The next prime is 66257255275301. The reversal of 66257255275243 is 34257255275266.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66257255275243 is a prime.

It is not a weakly prime, because it can be changed into another prime (66257255275223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33128627637621 + 33128627637622.

It is an arithmetic number, because the mean of its divisors is an integer number (33128627637622).

Almost surely, 2^{66257255275243} is an apocalyptic number.

66257255275243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66257255275243 is an equidigital number, since it uses as much as digits as its factorization.

66257255275243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680000, while the sum is 61.

The spelling of 66257255275243 in words is "sixty-six trillion, two hundred fifty-seven billion, two hundred fifty-five million, two hundred seventy-five thousand, two hundred forty-three".