1172873281536 has 720 divisors, whose sum is σ = 3900713005728. Its totient is φ = 351134023680.

The previous prime is 1172873281493. The next prime is 1172873281543. The reversal of 1172873281536 is 6351823782711.

1172873281536 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 87 + 3 + 28 + 1 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14131003351 + ... + 14131003433.

Almost surely, 2^{1172873281536} is an apocalyptic number.

1172873281536 is a gapful number since it is divisible by the number (16) 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 1172873281536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1950356502864).

1172873281536 is an abundant number, since it is smaller than the sum of its proper divisors (2727839724192).

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

1172873281536 is an frugal number, since it uses more digits than its factorization.

1172873281536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 99 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 1172873281536 in words is "one trillion, one hundred seventy-two billion, eight hundred seventy-three million, two hundred eighty-one thousand, five hundred thirty-six".