6639673860401 has 2 divisors, whose sum is σ = 6639673860402. Its totient is φ = 6639673860400.

The previous prime is 6639673860397. The next prime is 6639673860433. The reversal of 6639673860401 is 1040683769366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4231742694400 + 2407931166001 = 2057120^2 + 1551751^2 .

It is a cyclic number.

It is not a de Polignac number, because 6639673860401 - 2² = 6639673860397 is a prime.

It is not a weakly prime, because it can be changed into another prime (6639673860101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319836930200 + 3319836930201.

It is an arithmetic number, because the mean of its divisors is an integer number (3319836930201).

Almost surely, 2^{6639673860401} is an apocalyptic number.

It is an amenable number.

6639673860401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639673860401 is an equidigital number, since it uses as much as digits as its factorization.

6639673860401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 59.

The spelling of 6639673860401 in words is "six trillion, six hundred thirty-nine billion, six hundred seventy-three million, eight hundred sixty thousand, four hundred one".