6656542 has 4 divisors (see below), whose sum is σ = 9984816. Its totient is φ = 3328270.

The previous prime is 6656539. The next prime is 6656543. The reversal of 6656542 is 2456566.

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

It is a junction number, because it is equal to n+sod(n) for n = 6656498 and 6656507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656543) by changing a digit.

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, 1664134 + ... + 1664137.

It is an arithmetic number, because the mean of its divisors is an integer number (2496204).

Almost surely, 2^6656542 is an apocalyptic number.

6656542 is a deficient number, since it is larger than the sum of its proper divisors (3328274).

6656542 is a wasteful number, since it uses less digits than its factorization.

6656542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328273.

The product of its digits is 43200, while the sum is 34.

The square root of 6656542 is about 2580.0275192331. The cubic root of 6656542 is about 188.1118807421. Note that the first 3 decimals are identical.

The spelling of 6656542 in words is "six million, six hundred fifty-six thousand, five hundred forty-two".