161051665650 has 48 divisors (see below), whose sum is σ = 403525776864. Its totient is φ = 42504353280.

The previous prime is 161051665609. The next prime is 161051665661. The reversal of 161051665650 is 56566150161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5519872 + ... + 5548971.

It is an arithmetic number, because the mean of its divisors is an integer number (8406787018).

Almost surely, 2^161051665650 is an apocalyptic number.

161051665650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161051665650 is an abundant number, since it is smaller than the sum of its proper divisors (242474111214).

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

161051665650 is a wasteful number, since it uses less digits than its factorization.

161051665650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11068955 (or 11068950 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 161051665650 in words is "one hundred sixty-one billion, fifty-one million, six hundred sixty-five thousand, six hundred fifty".