66387037 has 2 divisors, whose sum is σ = 66387038. Its totient is φ = 66387036.

The previous prime is 66387031. The next prime is 66387047. The reversal of 66387037 is 73078366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58155876 + 8231161 = 7626^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 66387037 - 2⁷ = 66386909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66387031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33193518 + 33193519.

It is an arithmetic number, because the mean of its divisors is an integer number (33193519).

Almost surely, 2^66387037 is an apocalyptic number.

It is an amenable number.

66387037 is a deficient number, since it is larger than the sum of its proper divisors (1).

66387037 is an equidigital number, since it uses as much as digits as its factorization.

66387037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 66387037 is about 8147.8240653563. The cubic root of 66387037 is about 404.9124171736.

The spelling of 66387037 in words is "sixty-six million, three hundred eighty-seven thousand, thirty-seven".