6520343623 has 4 divisors (see below), whose sum is σ = 6803836848. Its totient is φ = 6236850400.

The previous prime is 6520343597. The next prime is 6520343647. The reversal of 6520343623 is 3263430256.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6520343623 is a prime.

It is a super-2 number, since 2×6520343623² = 85029761923993532258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520343653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141746578 + ... + 141746623.

It is an arithmetic number, because the mean of its divisors is an integer number (1700959212).

Almost surely, 2^6520343623 is an apocalyptic number.

6520343623 is a deficient number, since it is larger than the sum of its proper divisors (283493225).

6520343623 is a wasteful number, since it uses less digits than its factorization.

6520343623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283493224.

The product of its (nonzero) digits is 77760, while the sum is 34.

The square root of 6520343623 is about 80748.6447130848. The cubic root of 6520343623 is about 1868.2005455731.

Adding to 6520343623 its reverse (3263430256), we get a palindrome (9783773879).

The spelling of 6520343623 in words is "six billion, five hundred twenty million, three hundred forty-three thousand, six hundred twenty-three".