66025397 has 2 divisors, whose sum is σ = 66025398. Its totient is φ = 66025396.

The previous prime is 66025391. The next prime is 66025409. The reversal of 66025397 is 79352066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41809156 + 24216241 = 6466^2 + 4921^2 .

It is a cyclic number.

It is not a de Polignac number, because 66025397 - 2¹² = 66021301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66025397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66025391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33012698 + 33012699.

It is an arithmetic number, because the mean of its divisors is an integer number (33012699).

Almost surely, 2^66025397 is an apocalyptic number.

It is an amenable number.

66025397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66025397 is an equidigital number, since it uses as much as digits as its factorization.

66025397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 66025397 is about 8125.6013315939. The cubic root of 66025397 is about 404.1758314616.

The spelling of 66025397 in words is "sixty-six million, twenty-five thousand, three hundred ninety-seven".