117912581780 has 90 divisors (see below), whose sum is σ = 289053099594. Its totient is φ = 40401371808.

The previous prime is 117912581767. The next prime is 117912581851. The reversal of 117912581780 is 87185219711.

It can be written as a sum of positive squares in only one way, i.e., 94330065424 + 23582516356 = 307132^2 + 153566^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 75246557 + ... + 75248123.

Almost surely, 2^117912581780 is an apocalyptic number.

117912581780 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 117912581780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144526549797).

117912581780 is an abundant number, since it is smaller than the sum of its proper divisors (171140517814).

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

117912581780 is an frugal number, since it uses more digits than its factorization.

117912581780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171 (or 1581 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 50.

The spelling of 117912581780 in words is "one hundred seventeen billion, nine hundred twelve million, five hundred eighty-one thousand, seven hundred eighty".