1331326639820 has 12 divisors (see below), whose sum is σ = 2795785943664. Its totient is φ = 532530655920.

The previous prime is 1331326639817. The next prime is 1331326639829. The reversal of 1331326639820 is 289366231331.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1331326639829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33283165976 + ... + 33283166015.

It is an arithmetic number, because the mean of its divisors is an integer number (232982161972).

Almost surely, 2^{1331326639820} is an apocalyptic number.

1331326639820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331326639820 is an abundant number, since it is smaller than the sum of its proper divisors (1464459303844).

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

1331326639820 is a wasteful number, since it uses less digits than its factorization.

1331326639820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66566332000 (or 66566331998 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 1331326639820 in words is "one trillion, three hundred thirty-one billion, three hundred twenty-six million, six hundred thirty-nine thousand, eight hundred twenty".