3261639782591 has 2 divisors, whose sum is σ = 3261639782592. Its totient is φ = 3261639782590.

The previous prime is 3261639782459. The next prime is 3261639782629. The reversal of 3261639782591 is 1952879361623.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3261639782591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3261639682591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630819891295 + 1630819891296.

It is an arithmetic number, because the mean of its divisors is an integer number (1630819891296).

Almost surely, 2^{3261639782591} is an apocalyptic number.

3261639782591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3261639782591 is an equidigital number, since it uses as much as digits as its factorization.

3261639782591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29393280, while the sum is 62.

The spelling of 3261639782591 in words is "three trillion, two hundred sixty-one billion, six hundred thirty-nine million, seven hundred eighty-two thousand, five hundred ninety-one".