14131431665521 has 4 divisors (see below), whose sum is σ = 14261077827700. Its totient is φ = 14001785503344.

The previous prime is 14131431665513. The next prime is 14131431665537. The reversal of 14131431665521 is 12556613413141.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4029433949025 + 10101997716496 = 2007345^2 + 3178364^2 .

It is a cyclic number.

It is not a de Polignac number, because 14131431665521 - 2³ = 14131431665513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14131431665921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64823080926 + ... + 64823081143.

It is an arithmetic number, because the mean of its divisors is an integer number (3565269456925).

Almost surely, 2^{14131431665521} is an apocalyptic number.

It is an amenable number.

14131431665521 is a deficient number, since it is larger than the sum of its proper divisors (129646162179).

14131431665521 is a wasteful number, since it uses less digits than its factorization.

14131431665521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129646162178.

The product of its digits is 259200, while the sum is 43.

The spelling of 14131431665521 in words is "fourteen trillion, one hundred thirty-one billion, four hundred thirty-one million, six hundred sixty-five thousand, five hundred twenty-one".