66070997 has 2 divisors, whose sum is σ = 66070998. Its totient is φ = 66070996.

The previous prime is 66070883. The next prime is 66071021. The reversal of 66070997 is 79907066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 14432401 = 7186^2 + 3799^2 .

It is a cyclic number.

It is not a de Polignac number, because 66070997 - 2¹⁴ = 66054613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33035498 + 33035499.

It is an arithmetic number, because the mean of its divisors is an integer number (33035499).

Almost surely, 2^66070997 is an apocalyptic number.

It is an amenable number.

66070997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66070997 is an equidigital number, since it uses as much as digits as its factorization.

66070997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 66070997 is about 8128.4067934620. The cubic root of 66070997 is about 404.2688571630.

The spelling of 66070997 in words is "sixty-six million, seventy thousand, nine hundred ninety-seven".