66135497 has 2 divisors, whose sum is σ = 66135498. Its totient is φ = 66135496.

The previous prime is 66135463. The next prime is 66135527. The reversal of 66135497 is 79453166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 541696 = 8099^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 66135497 - 2⁸ = 66135241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66135427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33067748 + 33067749.

It is an arithmetic number, because the mean of its divisors is an integer number (33067749).

Almost surely, 2^66135497 is an apocalyptic number.

It is an amenable number.

66135497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66135497 is an equidigital number, since it uses as much as digits as its factorization.

66135497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 66135497 is about 8132.3733928048. The cubic root of 66135497 is about 404.4003665088.

The spelling of 66135497 in words is "sixty-six million, one hundred thirty-five thousand, four hundred ninety-seven".