6561959431937 has 8 divisors (see below), whose sum is σ = 8076257762496. Its totient is φ = 5191879990032.

The previous prime is 6561959431799. The next prime is 6561959431939. The reversal of 6561959431937 is 7391349591656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6561959431937 - 2¹⁰ = 6561959430913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6561959431939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36054722063 + ... + 36054722244.

It is an arithmetic number, because the mean of its divisors is an integer number (1009532220312).

Almost surely, 2^{6561959431937} is an apocalyptic number.

It is an amenable number.

6561959431937 is a deficient number, since it is larger than the sum of its proper divisors (1514298330559).

6561959431937 is a wasteful number, since it uses less digits than its factorization.

6561959431937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72109444327.

The product of its digits is 165337200, while the sum is 68.

The spelling of 6561959431937 in words is "six trillion, five hundred sixty-one billion, nine hundred fifty-nine million, four hundred thirty-one thousand, nine hundred thirty-seven".