6640013033261 has 2 divisors, whose sum is σ = 6640013033262. Its totient is φ = 6640013033260.

The previous prime is 6640013033237. The next prime is 6640013033281. The reversal of 6640013033261 is 1623303100466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6634178976100 + 5834057161 = 2575690^2 + 76381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6640013033261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640013033281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320006516630 + 3320006516631.

It is an arithmetic number, because the mean of its divisors is an integer number (3320006516631).

Almost surely, 2^{6640013033261} is an apocalyptic number.

It is an amenable number.

6640013033261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640013033261 is an equidigital number, since it uses as much as digits as its factorization.

6640013033261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 35.

The spelling of 6640013033261 in words is "six trillion, six hundred forty billion, thirteen million, thirty-three thousand, two hundred sixty-one".