1209163968720 has 240 divisors, whose sum is σ = 4275832579200. Its totient is φ = 305377827840.

The previous prime is 1209163968689. The next prime is 1209163968757. The reversal of 1209163968720 is 278693619021.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×1209163968720² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50727205 + ... + 50751035.

It is an arithmetic number, because the mean of its divisors is an integer number (17815969080).

Almost surely, 2^{1209163968720} is an apocalyptic number.

1209163968720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209163968720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2137916289600).

1209163968720 is an abundant number, since it is smaller than the sum of its proper divisors (3066668610480).

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

1209163968720 is a wasteful number, since it uses less digits than its factorization.

1209163968720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27578 (or 27569 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 1209163968720 in words is "one trillion, two hundred nine billion, one hundred sixty-three million, nine hundred sixty-eight thousand, seven hundred twenty".