1331225665 has 24 divisors (see below), whose sum is σ = 2006746560. Its totient is φ = 829852320.

The previous prime is 1331225659. The next prime is 1331225677. The reversal of 1331225665 is 5665221331.

It is not a de Polignac number, because 1331225665 - 2¹¹ = 1331223617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331225665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152935 + ... + 161404.

It is an arithmetic number, because the mean of its divisors is an integer number (83614440).

Almost surely, 2^1331225665 is an apocalyptic number.

It is an amenable number.

1331225665 is a deficient number, since it is larger than the sum of its proper divisors (675520895).

1331225665 is a wasteful number, since it uses less digits than its factorization.

1331225665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314373 (or 314362 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 1331225665 is about 36485.9653154470. The cubic root of 1331225665 is about 1100.0621631536.

Adding to 1331225665 its reverse (5665221331), we get a palindrome (6996446996).

The spelling of 1331225665 in words is "one billion, three hundred thirty-one million, two hundred twenty-five thousand, six hundred sixty-five".