6440581932091 has 2 divisors, whose sum is σ = 6440581932092. Its totient is φ = 6440581932090.

The previous prime is 6440581932079. The next prime is 6440581932139. The reversal of 6440581932091 is 1902391850446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6440581932091 - 2³³ = 6431991997499 is a prime.

It is not a weakly prime, because it can be changed into another prime (6440581932061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220290966045 + 3220290966046.

It is an arithmetic number, because the mean of its divisors is an integer number (3220290966046).

Almost surely, 2^{6440581932091} is an apocalyptic number.

6440581932091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440581932091 is an equidigital number, since it uses as much as digits as its factorization.

6440581932091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 6440581932091 in words is "six trillion, four hundred forty billion, five hundred eighty-one million, nine hundred thirty-two thousand, ninety-one".