6431407343561 has 8 divisors (see below), whose sum is σ = 6833288491560. Its totient is φ = 6053089259904.

The previous prime is 6431407343521. The next prime is 6431407343567. The reversal of 6431407343561 is 1653437041346.

It can be written as a sum of positive squares in 4 ways, for example, as 444014326336 + 5987393017225 = 666344^2 + 2446915^2 .

It is not a de Polignac number, because 6431407343561 - 2³⁰ = 6430333601737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6431407343567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654524636 + ... + 654534461.

It is an arithmetic number, because the mean of its divisors is an integer number (854161061445).

Almost surely, 2^{6431407343561} is an apocalyptic number.

It is an amenable number.

6431407343561 is a deficient number, since it is larger than the sum of its proper divisors (401881147999).

6431407343561 is an equidigital number, since it uses as much as digits as its factorization.

6431407343561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309059148 (or 1309059114 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 6431407343561 in words is "six trillion, four hundred thirty-one billion, four hundred seven million, three hundred forty-three thousand, five hundred sixty-one".