6645715 has 4 divisors (see below), whose sum is σ = 7974864. Its totient is φ = 5316568.

The previous prime is 6645713. The next prime is 6645721. The reversal of 6645715 is 5175466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6645715 - 2¹ = 6645713 is a prime.

It is a super-2 number, since 2×6645715² = 88331055722450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645713) 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, 664567 + ... + 664576.

It is an arithmetic number, because the mean of its divisors is an integer number (1993716).

Almost surely, 2^6645715 is an apocalyptic number.

6645715 is a deficient number, since it is larger than the sum of its proper divisors (1329149).

6645715 is a wasteful number, since it uses less digits than its factorization.

6645715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329148.

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

The square root of 6645715 is about 2577.9284319003. The cubic root of 6645715 is about 188.0098361385.

The spelling of 6645715 in words is "six million, six hundred forty-five thousand, seven hundred fifteen".