6660245 has 16 divisors (see below), whose sum is σ = 8355312. Its totient is φ = 5091840.

The previous prime is 6660239. The next prime is 6660287. The reversal of 6660245 is 5420666.

It can be written as a sum of positive squares in 8 ways, for example, as 2140369 + 4519876 = 1463^2 + 2126^2 .

It is not a de Polignac number, because 6660245 - 2²² = 2465941 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10559 + ... + 11171.

It is an arithmetic number, because the mean of its divisors is an integer number (522207).

Almost surely, 2^6660245 is an apocalyptic number.

It is an amenable number.

6660245 is a deficient number, since it is larger than the sum of its proper divisors (1695067).

6660245 is a wasteful number, since it uses less digits than its factorization.

6660245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 6660245 is about 2580.7450474621. The cubic root of 6660245 is about 188.1467561657.

The spelling of 6660245 in words is "six million, six hundred sixty thousand, two hundred forty-five".