6561983953959 has 16 divisors (see below), whose sum is σ = 10090949552640. Its totient is φ = 3715304150880.

The previous prime is 6561983953951. The next prime is 6561983953969. The reversal of 6561983953959 is 9593593891656.

It is not a de Polignac number, because 6561983953959 - 2³ = 6561983953951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561983953951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1433371227 + ... + 1433375804.

It is an arithmetic number, because the mean of its divisors is an integer number (630684347040).

Almost surely, 2^{6561983953959} is an apocalyptic number.

6561983953959 is a deficient number, since it is larger than the sum of its proper divisors (3528965598681).

6561983953959 is a wasteful number, since it uses less digits than its factorization.

6561983953959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866747150.

The product of its digits is 2125764000, while the sum is 78.

The spelling of 6561983953959 in words is "six trillion, five hundred sixty-one billion, nine hundred eighty-three million, nine hundred fifty-three thousand, nine hundred fifty-nine".