6386740978609 has 2 divisors, whose sum is σ = 6386740978610. Its totient is φ = 6386740978608.

The previous prime is 6386740978561. The next prime is 6386740978649. The reversal of 6386740978609 is 9068790476836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6325300450225 + 61440528384 = 2515015^2 + 247872^2 .

It is a cyclic number.

It is not a de Polignac number, because 6386740978609 - 2¹³ = 6386740970417 is a prime.

It is not a weakly prime, because it can be changed into another prime (6386740978649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3193370489304 + 3193370489305.

It is an arithmetic number, because the mean of its divisors is an integer number (3193370489305).

Almost surely, 2^{6386740978609} is an apocalyptic number.

It is an amenable number.

6386740978609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6386740978609 is an equidigital number, since it uses as much as digits as its factorization.

6386740978609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658409472, while the sum is 73.

The spelling of 6386740978609 in words is "six trillion, three hundred eighty-six billion, seven hundred forty million, nine hundred seventy-eight thousand, six hundred nine".