1331163264 has 64 divisors (see below), whose sum is σ = 3602672640. Its totient is φ = 435342336.

The previous prime is 1331163247. The next prime is 1331163283. The reversal of 1331163264 is 4623611331.

It is a tau number, because it is divible by the number of its divisors (64).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12352 + ... + 53055.

It is an arithmetic number, because the mean of its divisors is an integer number (56291760).

Almost surely, 2^1331163264 is an apocalyptic number.

It is an amenable number.

1331163264 is an abundant number, since it is smaller than the sum of its proper divisors (2271509376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331163264 is an equidigital number, since it uses as much as digits as its factorization.

1331163264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65477 (or 65465 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 1331163264 is about 36485.1101683961. The cubic root of 1331163264 is about 1100.0449744697.

Adding to 1331163264 its reverse (4623611331), we get a palindrome (5954774595).

The spelling of 1331163264 in words is "one billion, three hundred thirty-one million, one hundred sixty-three thousand, two hundred sixty-four".