6660430270649 has 2 divisors, whose sum is σ = 6660430270650. Its totient is φ = 6660430270648.

The previous prime is 6660430270639. The next prime is 6660430270661. The reversal of 6660430270649 is 9460720340666.

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., 6028532464249 + 631897806400 = 2455307^2 + 794920^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660430270649 - 2²⁸ = 6660161835193 is a prime.

It is a super-2 number, since 2×6660430270649² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660430270649.

It is not a weakly prime, because it can be changed into another prime (6660430270619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330215135324 + 3330215135325.

It is an arithmetic number, because the mean of its divisors is an integer number (3330215135325).

Almost surely, 2^{6660430270649} is an apocalyptic number.

It is an amenable number.

6660430270649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660430270649 is an equidigital number, since it uses as much as digits as its factorization.

6660430270649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 53.

The spelling of 6660430270649 in words is "six trillion, six hundred sixty billion, four hundred thirty million, two hundred seventy thousand, six hundred forty-nine".