66572145457 has 2 divisors, whose sum is σ = 66572145458. Its totient is φ = 66572145456.

The previous prime is 66572145407. The next prime is 66572145463. The reversal of 66572145457 is 75454127566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33681058576 + 32891086881 = 183524^2 + 181359^2 .

It is a cyclic number.

It is not a de Polignac number, because 66572145457 - 2¹¹ = 66572143409 is a prime.

It is not a weakly prime, because it can be changed into another prime (66572145407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286072728 + 33286072729.

It is an arithmetic number, because the mean of its divisors is an integer number (33286072729).

Almost surely, 2^66572145457 is an apocalyptic number.

It is an amenable number.

66572145457 is a deficient number, since it is larger than the sum of its proper divisors (1).

66572145457 is an equidigital number, since it uses as much as digits as its factorization.

66572145457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056000, while the sum is 52.

The spelling of 66572145457 in words is "sixty-six billion, five hundred seventy-two million, one hundred forty-five thousand, four hundred fifty-seven".