6660669 has 16 divisors (see below), whose sum is σ = 9139392. Its totient is φ = 4313088.

The previous prime is 6660649. The next prime is 6660677. The reversal of 6660669 is 9660666.

It is a de Polignac number, because none of the positive numbers 2^k-6660669 is a prime.

It is a super-2 number, since 2×6660669² = 88729023055122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25789 + ... + 26045.

It is an arithmetic number, because the mean of its divisors is an integer number (571212).

Almost surely, 2^6660669 is an apocalyptic number.

It is an amenable number.

6660669 is a deficient number, since it is larger than the sum of its proper divisors (2478723).

6660669 is a wasteful number, since it uses less digits than its factorization.

6660669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 6660669 is about 2580.8271929752. The cubic root of 6660669 is about 188.1507486380.

It can be divided in two parts, 6 and 660669, that added together give a triangular number (660675 = T₁₁₄₉).

The spelling of 6660669 in words is "six million, six hundred sixty thousand, six hundred sixty-nine".