6642535 has 4 divisors (see below), whose sum is σ = 7971048. Its totient is φ = 5314024.

The previous prime is 6642523. The next prime is 6642539. The reversal of 6642535 is 5352466.

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-6642535 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6642497 and 6642506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642539) 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, 664249 + ... + 664258.

It is an arithmetic number, because the mean of its divisors is an integer number (1992762).

Almost surely, 2^6642535 is an apocalyptic number.

6642535 is a deficient number, since it is larger than the sum of its proper divisors (1328513).

6642535 is a wasteful number, since it uses less digits than its factorization.

6642535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328512.

The product of its digits is 21600, while the sum is 31.

The square root of 6642535 is about 2577.3115838020. The cubic root of 6642535 is about 187.9798435460.

The spelling of 6642535 in words is "six million, six hundred forty-two thousand, five hundred thirty-five".