3261645164881 has 2 divisors, whose sum is σ = 3261645164882. Its totient is φ = 3261645164880.

The previous prime is 3261645164801. The next prime is 3261645164909. The reversal of 3261645164881 is 1884615461623.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3244624048656 + 17021116225 = 1801284^2 + 130465^2 .

It is a cyclic number.

It is not a de Polignac number, because 3261645164881 - 2¹³ = 3261645156689 is a prime.

It is a super-2 number, since 2×3261645164881² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3261645164801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630822582440 + 1630822582441.

It is an arithmetic number, because the mean of its divisors is an integer number (1630822582441).

Almost surely, 2^{3261645164881} is an apocalyptic number.

It is an amenable number.

3261645164881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3261645164881 is an equidigital number, since it uses as much as digits as its factorization.

3261645164881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 55.

The spelling of 3261645164881 in words is "three trillion, two hundred sixty-one billion, six hundred forty-five million, one hundred sixty-four thousand, eight hundred eighty-one".