6661715 has 4 divisors (see below), whose sum is σ = 7994064. Its totient is φ = 5329368.

The previous prime is 6661709. The next prime is 6661727. The reversal of 6661715 is 5171666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5171666 = 2 ⋅2585833.

It is a cyclic number.

It is not a de Polignac number, because 6661715 - 2¹⁶ = 6596179 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666167 + ... + 666176.

It is an arithmetic number, because the mean of its divisors is an integer number (1998516).

Almost surely, 2^6661715 is an apocalyptic number.

6661715 is a deficient number, since it is larger than the sum of its proper divisors (1332349).

6661715 is a wasteful number, since it uses less digits than its factorization.

6661715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332348.

The product of its digits is 7560, while the sum is 32.

The square root of 6661715 is about 2581.0298332255. The cubic root of 6661715 is about 188.1605972674.

The spelling of 6661715 in words is "six million, six hundred sixty-one thousand, seven hundred fifteen".