66849352397 has 2 divisors, whose sum is σ = 66849352398. Its totient is φ = 66849352396.

The previous prime is 66849352387. The next prime is 66849352439. The reversal of 66849352397 is 79325394866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38953337956 + 27896014441 = 197366^2 + 167021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66849352397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66849352387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33424676198 + 33424676199.

It is an arithmetic number, because the mean of its divisors is an integer number (33424676199).

Almost surely, 2^66849352397 is an apocalyptic number.

It is an amenable number.

66849352397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66849352397 is an equidigital number, since it uses as much as digits as its factorization.

66849352397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 62.

The spelling of 66849352397 in words is "sixty-six billion, eight hundred forty-nine million, three hundred fifty-two thousand, three hundred ninety-seven".