6445020522531 has 16 divisors (see below), whose sum is σ = 9078298611200. Its totient is φ = 4055844179808.

The previous prime is 6445020522511. The next prime is 6445020522553. The reversal of 6445020522531 is 1352250205446.

It is not a de Polignac number, because 6445020522531 - 2⁶ = 6445020522467 is a prime.

It is a super-2 number, since 2×6445020522531² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6445020522531.

It is not an unprimeable number, because it can be changed into a prime (6445020522511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204082651 + ... + 204114228.

It is an arithmetic number, because the mean of its divisors is an integer number (567393663200).

Almost surely, 2^{6445020522531} is an apocalyptic number.

6445020522531 is a deficient number, since it is larger than the sum of its proper divisors (2633278088669).

6445020522531 is a wasteful number, since it uses less digits than its factorization.

6445020522531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408197178.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 6445020522531 its reverse (1352250205446), we get a palindrome (7797270727977).

The spelling of 6445020522531 in words is "six trillion, four hundred forty-five billion, twenty million, five hundred twenty-two thousand, five hundred thirty-one".