66237749 has 2 divisors, whose sum is σ = 66237750. Its totient is φ = 66237748.

The previous prime is 66237737. The next prime is 66237761. The reversal of 66237749 is 94773266.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66237737) and next prime (66237761).

It can be written as a sum of positive squares in only one way, i.e., 64915249 + 1322500 = 8057^2 + 1150^2 .

It is a cyclic number.

It is not a de Polignac number, because 66237749 - 2²⁴ = 49460533 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 (66237709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33118874 + 33118875.

It is an arithmetic number, because the mean of its divisors is an integer number (33118875).

Almost surely, 2^66237749 is an apocalyptic number.

It is an amenable number.

66237749 is a deficient number, since it is larger than the sum of its proper divisors (1).

66237749 is an equidigital number, since it uses as much as digits as its factorization.

66237749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 44.

The square root of 66237749 is about 8138.6576903074. The cubic root of 66237749 is about 404.6086734728.

The spelling of 66237749 in words is "sixty-six million, two hundred thirty-seven thousand, seven hundred forty-nine".