66457757 has 2 divisors, whose sum is σ = 66457758. Its totient is φ = 66457756.

The previous prime is 66457751. The next prime is 66457771. The reversal of 66457757 is 75775466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62900761 + 3556996 = 7931^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 66457757 - 2⁶ = 66457693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66457751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33228878 + 33228879.

It is an arithmetic number, because the mean of its divisors is an integer number (33228879).

Almost surely, 2^66457757 is an apocalyptic number.

It is an amenable number.

66457757 is a deficient number, since it is larger than the sum of its proper divisors (1).

66457757 is an equidigital number, since it uses as much as digits as its factorization.

66457757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 47.

The square root of 66457757 is about 8152.1627191807. The cubic root of 66457757 is about 405.0561462575.

The spelling of 66457757 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred fifty-seven".