1321159538808 has 24 divisors (see below), whose sum is σ = 3578140417800. Its totient is φ = 440386512912.

The previous prime is 1321159538761. The next prime is 1321159538819. The reversal of 1321159538808 is 8088359511231.

1321159538808 is a `hidden beast` number, since 1 + 3 + 2 + 11 + 595 + 38 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 9174718948 + ... + 9174719091.

It is an arithmetic number, because the mean of its divisors is an integer number (149089184075).

Almost surely, 2^{1321159538808} is an apocalyptic number.

1321159538808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1321159538808 is an abundant number, since it is smaller than the sum of its proper divisors (2256980878992).

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

1321159538808 is a wasteful number, since it uses less digits than its factorization.

1321159538808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18349438051 (or 18349438044 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 1321159538808 in words is "one trillion, three hundred twenty-one billion, one hundred fifty-nine million, five hundred thirty-eight thousand, eight hundred eight".