331266661 has 24 divisors (see below), whose sum is σ = 380404472. Its totient is φ = 287971200.

The previous prime is 331266659. The next prime is 331266701. The reversal of 331266661 is 166662133.

It can be written as a sum of positive squares in 4 ways, for example, as 245025 + 331021636 = 495^2 + 18194^2 .

It is not a de Polignac number, because 331266661 - 2¹ = 331266659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331266601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 272491 + ... + 273703.

Almost surely, 2^331266661 is an apocalyptic number.

It is an amenable number.

331266661 is a deficient number, since it is larger than the sum of its proper divisors (49137811).

331266661 is a wasteful number, since it uses less digits than its factorization.

331266661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1322 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 331266661 is about 18200.7324303172. The cubic root of 331266661 is about 691.9253521058.

The spelling of 331266661 in words is "three hundred thirty-one million, two hundred sixty-six thousand, six hundred sixty-one".