1321163731288 has 8 divisors (see below), whose sum is σ = 2477181996180. Its totient is φ = 660581865640.

The previous prime is 1321163731253. The next prime is 1321163731289. The reversal of 1321163731288 is 8821373611231.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321163731289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82572733198 + ... + 82572733213.

Almost surely, 2^{1321163731288} is an apocalyptic number.

It is an amenable number.

1321163731288 is a deficient number, since it is larger than the sum of its proper divisors (1156018264892).

1321163731288 is a wasteful number, since it uses less digits than its factorization.

1321163731288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165145466417 (or 165145466413 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The spelling of 1321163731288 in words is "one trillion, three hundred twenty-one billion, one hundred sixty-three million, seven hundred thirty-one thousand, two hundred eighty-eight".