66672797 has 2 divisors, whose sum is σ = 66672798. Its totient is φ = 66672796.

The previous prime is 66672787. The next prime is 66672803. The reversal of 66672797 is 79727666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45778756 + 20894041 = 6766^2 + 4571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66672797 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 (66672707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336398 + 33336399.

It is an arithmetic number, because the mean of its divisors is an integer number (33336399).

Almost surely, 2^66672797 is an apocalyptic number.

It is an amenable number.

66672797 is a deficient number, since it is larger than the sum of its proper divisors (1).

66672797 is an equidigital number, since it uses as much as digits as its factorization.

66672797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 50.

The square root of 66672797 is about 8165.3412053631. The cubic root of 66672797 is about 405.4925612992.

The spelling of 66672797 in words is "sixty-six million, six hundred seventy-two thousand, seven hundred ninety-seven".