6645751 has 8 divisors (see below), whose sum is σ = 7612704. Its totient is φ = 5683200.

The previous prime is 6645739. The next prime is 6645757. The reversal of 6645751 is 1575466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6645751 - 2¹⁹ = 6121463 is a prime.

It is a Duffinian number.

6645751 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351 + ... + 4951.

It is an arithmetic number, because the mean of its divisors is an integer number (951588).

Almost surely, 2^6645751 is an apocalyptic number.

6645751 is a deficient number, since it is larger than the sum of its proper divisors (966953).

6645751 is a wasteful number, since it uses less digits than its factorization.

6645751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201.

The product of its digits is 25200, while the sum is 34.

The square root of 6645751 is about 2577.9354142414. The cubic root of 6645751 is about 188.0101756225.

It can be divided in two parts, 6645 and 751, that added together give a square (7396 = 86²).

The spelling of 6645751 in words is "six million, six hundred forty-five thousand, seven hundred fifty-one".