161117555740000 has 120 divisors (see below), whose sum is σ = 396387738414360. Its totient is φ = 64444683648000.

The previous prime is 161117555739989. The next prime is 161117555740007. The reversal of 161117555740000 is 47555711161.

161117555740000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161117555740007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 615929236 + ... + 616190764.

It is an arithmetic number, because the mean of its divisors is an integer number (3303231153453).

Almost surely, 2^{161117555740000} is an apocalyptic number.

161117555740000 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 161117555740000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198193869207180).

161117555740000 is an abundant number, since it is smaller than the sum of its proper divisors (235270182674360).

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

161117555740000 is an equidigital number, since it uses as much as digits as its factorization.

161117555740000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292362 (or 292339 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 43.

The spelling of 161117555740000 in words is "one hundred sixty-one trillion, one hundred seventeen billion, five hundred fifty-five million, seven hundred forty thousand".