6645442 has 4 divisors (see below), whose sum is σ = 9968166. Its totient is φ = 3322720.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645442 is 2445466.

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., 5851561 + 793881 = 2419^2 + 891^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661359 + ... + 1661362.

Almost surely, 2^6645442 is an apocalyptic number.

6645442 is a deficient number, since it is larger than the sum of its proper divisors (3322724).

6645442 is a wasteful number, since it uses less digits than its factorization.

6645442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322723.

The product of its digits is 23040, while the sum is 31.

The square root of 6645442 is about 2577.8754818649. The cubic root of 6645442 is about 188.0072616782.

The spelling of 6645442 in words is "six million, six hundred forty-five thousand, four hundred forty-two".