6639202154297 has 2 divisors, whose sum is σ = 6639202154298. Its totient is φ = 6639202154296.

The previous prime is 6639202154293. The next prime is 6639202154339. The reversal of 6639202154297 is 7924512029366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5188969640761 + 1450232513536 = 2277931^2 + 1204256^2 .

It is a cyclic number.

It is not a de Polignac number, because 6639202154297 - 2² = 6639202154293 is a prime.

It is not a weakly prime, because it can be changed into another prime (6639202154293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319601077148 + 3319601077149.

It is an arithmetic number, because the mean of its divisors is an integer number (3319601077149).

Almost surely, 2^{6639202154297} is an apocalyptic number.

It is an amenable number.

6639202154297 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639202154297 is an equidigital number, since it uses as much as digits as its factorization.

6639202154297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 6639202154297 in words is "six trillion, six hundred thirty-nine billion, two hundred two million, one hundred fifty-four thousand, two hundred ninety-seven".