6645534 has 16 divisors (see below), whose sum is σ = 15189888. Its totient is φ = 1898712.

The previous prime is 6645517. The next prime is 6645547. The reversal of 6645534 is 4355466.

It is a junction number, because it is equal to n+sod(n) for n = 6645495 and 6645504.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 79072 + ... + 79155.

It is an arithmetic number, because the mean of its divisors is an integer number (949368).

Almost surely, 2^6645534 is an apocalyptic number.

6645534 is an abundant number, since it is smaller than the sum of its proper divisors (8544354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6645534 is a wasteful number, since it uses less digits than its factorization.

6645534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158239.

The product of its digits is 43200, while the sum is 33.

The square root of 6645534 is about 2577.8933259544. The cubic root of 6645534 is about 188.0081292697.

The spelling of 6645534 in words is "six million, six hundred forty-five thousand, five hundred thirty-four".