66145697 has 2 divisors, whose sum is σ = 66145698. Its totient is φ = 66145696.

The previous prime is 66145693. The next prime is 66145711. The reversal of 66145697 is 79654166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48497296 + 17648401 = 6964^2 + 4201^2 .

It is a cyclic number.

It is not a de Polignac number, because 66145697 - 2² = 66145693 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66145693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072848 + 33072849.

It is an arithmetic number, because the mean of its divisors is an integer number (33072849).

Almost surely, 2^66145697 is an apocalyptic number.

It is an amenable number.

66145697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66145697 is an equidigital number, since it uses as much as digits as its factorization.

66145697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 66145697 is about 8133.0004918234. Note that the first 3 decimals coincide. The cubic root of 66145697 is about 404.4211555045.

The spelling of 66145697 in words is "sixty-six million, one hundred forty-five thousand, six hundred ninety-seven".