161011550064 has 80 divisors (see below), whose sum is σ = 430549362720. Its totient is φ = 51788513280.

The previous prime is 161011549961. The next prime is 161011550171. The reversal of 161011550064 is 460055110161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2328144 + ... + 2396304.

It is an arithmetic number, because the mean of its divisors is an integer number (5381867034).

Almost surely, 2^161011550064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161011550064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215274681360).

161011550064 is an abundant number, since it is smaller than the sum of its proper divisors (269537812656).

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

161011550064 is a wasteful number, since it uses less digits than its factorization.

161011550064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69898 (or 69892 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 161011550064 in words is "one hundred sixty-one billion, eleven million, five hundred fifty thousand, sixty-four".