161837654528 has 80 divisors (see below), whose sum is σ = 354706672320. Its totient is φ = 73155686400.

The previous prime is 161837654509. The next prime is 161837654579. The reversal of 161837654528 is 825456738161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940013 + ... + 1098771.

It is an arithmetic number, because the mean of its divisors is an integer number (4433833404).

Almost surely, 2^161837654528 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 161837654528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177353336160).

161837654528 is an abundant number, since it is smaller than the sum of its proper divisors (192869017792).

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

161837654528 is a wasteful number, since it uses less digits than its factorization.

161837654528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158969 (or 158953 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 56.

The spelling of 161837654528 in words is "one hundred sixty-one billion, eight hundred thirty-seven million, six hundred fifty-four thousand, five hundred twenty-eight".