6645427 has 4 divisors (see below), whose sum is σ = 6657336. Its totient is φ = 6633520.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645427 is 7245466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7245466 = 2 ⋅3622733.

It is a cyclic number.

It is not a de Polignac number, because 6645427 - 2¹⁵ = 6612659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6645392 and 6645401.

It is not an unprimeable number, because it can be changed into a prime (6645467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5074 + ... + 6247.

It is an arithmetic number, because the mean of its divisors is an integer number (1664334).

Almost surely, 2^6645427 is an apocalyptic number.

6645427 is a deficient number, since it is larger than the sum of its proper divisors (11909).

6645427 is a wasteful number, since it uses less digits than its factorization.

6645427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11908.

The product of its digits is 40320, while the sum is 34.

The square root of 6645427 is about 2577.8725724907. The cubic root of 6645427 is about 188.0071202223.

The spelling of 6645427 in words is "six million, six hundred forty-five thousand, four hundred twenty-seven".