66572251279 has 2 divisors, whose sum is σ = 66572251280. Its totient is φ = 66572251278.

The previous prime is 66572251267. The next prime is 66572251303. The reversal of 66572251279 is 97215227566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66572251279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66572251679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286125639 + 33286125640.

It is an arithmetic number, because the mean of its divisors is an integer number (33286125640).

Almost surely, 2^66572251279 is an apocalyptic number.

66572251279 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572251279 is an equidigital number, since it uses as much as digits as its factorization.

66572251279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 52.

The spelling of 66572251279 in words is "sixty-six billion, five hundred seventy-two million, two hundred fifty-one thousand, two hundred seventy-nine".