6661331 has 8 divisors (see below), whose sum is σ = 7139664. Its totient is φ = 6192640.

The previous prime is 6661327. The next prime is 6661337. The reversal of 6661331 is 1331666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6661331 - 2² = 6661327 is a prime.

It is a super-2 number, since 2×6661331² = 88746661383122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661331.

It is not an unprimeable number, because it can be changed into a prime (6661337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (892458).

Almost surely, 2^6661331 is an apocalyptic number.

6661331 is a deficient number, since it is larger than the sum of its proper divisors (478333).

6661331 is a wasteful number, since it uses less digits than its factorization.

6661331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821.

The product of its digits is 1944, while the sum is 26.

The square root of 6661331 is about 2580.9554432419. The cubic root of 6661331 is about 188.1569818292.

Adding to 6661331 its reverse (1331666), we get a palindrome (7992997).

It can be divided in two parts, 666 and 1331, that multiplied together give a triangular number (886446 = T₁₃₃₁).

The spelling of 6661331 in words is "six million, six hundred sixty-one thousand, three hundred thirty-one".