6625643 has 4 divisors (see below), whose sum is σ = 6632808. Its totient is φ = 6618480.

The previous prime is 6625639. The next prime is 6625667. The reversal of 6625643 is 3465266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6625643 - 2² = 6625639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6625603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946 + ... + 4127.

It is an arithmetic number, because the mean of its divisors is an integer number (1658202).

Almost surely, 2^6625643 is an apocalyptic number.

6625643 is a deficient number, since it is larger than the sum of its proper divisors (7165).

6625643 is a wasteful number, since it uses less digits than its factorization.

6625643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164.

The product of its digits is 25920, while the sum is 32.

The square root of 6625643 is about 2574.0324395780. The cubic root of 6625643 is about 187.8203637201.

The spelling of 6625643 in words is "six million, six hundred twenty-five thousand, six hundred forty-three".