66142073 has 2 divisors, whose sum is σ = 66142074. Its totient is φ = 66142072.

The previous prime is 66142057. The next prime is 66142081. The reversal of 66142073 is 37024166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51724864 + 14417209 = 7192^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 66142073 - 2⁴ = 66142057 is a prime.

It is not a weakly prime, because it can be changed into another prime (66142033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33071036 + 33071037.

It is an arithmetic number, because the mean of its divisors is an integer number (33071037).

Almost surely, 2^66142073 is an apocalyptic number.

It is an amenable number.

66142073 is a deficient number, since it is larger than the sum of its proper divisors (1).

66142073 is an equidigital number, since it uses as much as digits as its factorization.

66142073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 66142073 is about 8132.7776927689. Note that the first 3 decimals coincide. The cubic root of 66142073 is about 404.4137695414.

The spelling of 66142073 in words is "sixty-six million, one hundred forty-two thousand, seventy-three".