66903197 has 2 divisors, whose sum is σ = 66903198. Its totient is φ = 66903196.

The previous prime is 66903191. The next prime is 66903209. The reversal of 66903197 is 79130966.

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., 36554116 + 30349081 = 6046^2 + 5509^2 .

It is a cyclic number.

It is not a de Polignac number, because 66903197 - 2¹⁸ = 66641053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66903191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33451598 + 33451599.

It is an arithmetic number, because the mean of its divisors is an integer number (33451599).

Almost surely, 2^66903197 is an apocalyptic number.

It is an amenable number.

66903197 is a deficient number, since it is larger than the sum of its proper divisors (1).

66903197 is an equidigital number, since it uses as much as digits as its factorization.

66903197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 66903197 is about 8179.4374500940. The cubic root of 66903197 is about 405.9591087777.

The spelling of 66903197 in words is "sixty-six million, nine hundred three thousand, one hundred ninety-seven".