6665961 has 16 divisors (see below), whose sum is σ = 9244160. Its totient is φ = 4268160.

The previous prime is 6665959. The next prime is 6665987. The reversal of 6665961 is 1695666.

It is not a de Polignac number, because 6665961 - 2¹ = 6665959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665951) 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, 21141 + ... + 21453.

It is an arithmetic number, because the mean of its divisors is an integer number (577760).

Almost surely, 2^6665961 is an apocalyptic number.

It is an amenable number.

6665961 is a deficient number, since it is larger than the sum of its proper divisors (2578199).

6665961 is a wasteful number, since it uses less digits than its factorization.

6665961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 58320, while the sum is 39.

The square root of 6665961 is about 2581.8522420929. The cubic root of 6665961 is about 188.2005649643.

It can be divided in two parts, 6665 and 961, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 6665961 in words is "six million, six hundred sixty-five thousand, nine hundred sixty-one".