161161501000 has 64 divisors (see below), whose sum is σ = 381891744000. Its totient is φ = 63648561600.

The previous prime is 161161500953. The next prime is 161161501003. The reversal of 161161501000 is 105161161.

It is not an unprimeable number, because it can be changed into a prime (161161501003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941010 + ... + 1099009.

It is an arithmetic number, because the mean of its divisors is an integer number (5967058500).

Almost surely, 2^161161501000 is an apocalyptic number.

161161501000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161161501000 is an abundant number, since it is smaller than the sum of its proper divisors (220730243000).

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

161161501000 is a wasteful number, since it uses less digits than its factorization.

161161501000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040119 (or 2040105 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 22.

Adding to 161161501000 its reverse (105161161), we get a palindrome (161266662161).

The spelling of 161161501000 in words is "one hundred sixty-one billion, one hundred sixty-one million, five hundred one thousand".