6642259 has 4 divisors (see below), whose sum is σ = 7153216. Its totient is φ = 6131304.

The previous prime is 6642211. The next prime is 6642281. The reversal of 6642259 is 9522466.

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-6642259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6642289) 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, 255459 + ... + 255484.

It is an arithmetic number, because the mean of its divisors is an integer number (1788304).

Almost surely, 2^6642259 is an apocalyptic number.

6642259 is a deficient number, since it is larger than the sum of its proper divisors (510957).

6642259 is a wasteful number, since it uses less digits than its factorization.

6642259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510956.

The product of its digits is 25920, while the sum is 34.

The square root of 6642259 is about 2577.2580390795. The cubic root of 6642259 is about 187.9772399639.

It can be divided in two parts, 664225 and 9, that multiplied together give a square (5978025 = 2445²).

The spelling of 6642259 in words is "six million, six hundred forty-two thousand, two hundred fifty-nine".