6531421262645 has 32 divisors (see below), whose sum is σ = 7941913056000. Its totient is φ = 5156118825984.

The previous prime is 6531421262623. The next prime is 6531421262671. The reversal of 6531421262645 is 5462621241356.

It is a cyclic number.

It is not a de Polignac number, because 6531421262645 - 2¹⁰ = 6531421261621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6531421262645.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 129919784 + ... + 129970046.

It is an arithmetic number, because the mean of its divisors is an integer number (248184783000).

Almost surely, 2^{6531421262645} is an apocalyptic number.

It is an amenable number.

6531421262645 is a deficient number, since it is larger than the sum of its proper divisors (1410491793355).

6531421262645 is a wasteful number, since it uses less digits than its factorization.

6531421262645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51389.

The product of its digits is 2073600, while the sum is 47.

The spelling of 6531421262645 in words is "six trillion, five hundred thirty-one billion, four hundred twenty-one million, two hundred sixty-two thousand, six hundred forty-five".