6642523 has 2 divisors, whose sum is σ = 6642524. Its totient is φ = 6642522.

The previous prime is 6642521. The next prime is 6642539. The reversal of 6642523 is 3252466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6642523 - 2¹ = 6642521 is a prime.

It is a super-2 number, since 2×6642523² = 88246223611058, which contains 22 as substring.

Together with 6642521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6642491 and 6642500.

It is not a weakly prime, because it can be changed into another prime (6642521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321261 + 3321262.

It is an arithmetic number, because the mean of its divisors is an integer number (3321262).

Almost surely, 2^6642523 is an apocalyptic number.

6642523 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642523 is an equidigital number, since it uses as much as digits as its factorization.

6642523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

The square root of 6642523 is about 2577.3092557937. The cubic root of 6642523 is about 187.9797303482.

Adding to 6642523 its reverse (3252466), we get a palindrome (9894989).

The spelling of 6642523 in words is "six million, six hundred forty-two thousand, five hundred twenty-three".