6645242 has 4 divisors (see below), whose sum is σ = 9967866. Its totient is φ = 3322620.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645242 is 2425466.

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

It can be written as a sum of positive squares in only one way, i.e., 6507601 + 137641 = 2551^2 + 371^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661309 + ... + 1661312.

Almost surely, 2^6645242 is an apocalyptic number.

6645242 is a deficient number, since it is larger than the sum of its proper divisors (3322624).

6645242 is a wasteful number, since it uses less digits than its factorization.

6645242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322623.

The product of its digits is 11520, while the sum is 29.

The square root of 6645242 is about 2577.8366899398. The cubic root of 6645242 is about 188.0053755819.

The spelling of 6645242 in words is "six million, six hundred forty-five thousand, two hundred forty-two".