66357197 has 2 divisors, whose sum is σ = 66357198. Its totient is φ = 66357196.

The previous prime is 66357173. The next prime is 66357211. The reversal of 66357197 is 79175366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 244036 = 8131^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 66357197 - 2¹² = 66353101 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 (66357107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178598 + 33178599.

It is an arithmetic number, because the mean of its divisors is an integer number (33178599).

Almost surely, 2^66357197 is an apocalyptic number.

It is an amenable number.

66357197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66357197 is an equidigital number, since it uses as much as digits as its factorization.

66357197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 66357197 is about 8145.9926957983. The cubic root of 66357197 is about 404.8517406829.

The spelling of 66357197 in words is "sixty-six million, three hundred fifty-seven thousand, one hundred ninety-seven".