66045997 has 2 divisors, whose sum is σ = 66045998. Its totient is φ = 66045996.

The previous prime is 66045983. The next prime is 66046007. The reversal of 66045997 is 79954066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54081316 + 11964681 = 7354^2 + 3459^2 .

It is a cyclic number.

It is not a de Polignac number, because 66045997 - 2⁷ = 66045869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66045907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33022998 + 33022999.

It is an arithmetic number, because the mean of its divisors is an integer number (33022999).

Almost surely, 2^66045997 is an apocalyptic number.

It is an amenable number.

66045997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66045997 is an equidigital number, since it uses as much as digits as its factorization.

66045997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 66045997 is about 8126.8688312289. The cubic root of 66045997 is about 404.2178615326.

The spelling of 66045997 in words is "sixty-six million, forty-five thousand, nine hundred ninety-seven".