161106665000 has 80 divisors (see below), whose sum is σ = 377625996000. Its totient is φ = 64416536000.

The previous prime is 161106664991. The next prime is 161106665003. The reversal of 161106665000 is 566601161.

It is not an unprimeable number, because it can be changed into a prime (161106665003) 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, 16490117 + ... + 16499883.

It is an arithmetic number, because the mean of its divisors is an integer number (4720324950).

Almost surely, 2^161106665000 is an apocalyptic number.

161106665000 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 161106665000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188812998000).

161106665000 is an abundant number, since it is smaller than the sum of its proper divisors (216519331000).

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

161106665000 is an equidigital number, since it uses as much as digits as its factorization.

161106665000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13092 (or 13073 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 161106665000 in words is "one hundred sixty-one billion, one hundred six million, six hundred sixty-five thousand".