161810636646048 has 384 divisors, whose sum is σ = 478592028794880. Its totient is φ = 47548172206080.

The previous prime is 161810636645971. The next prime is 161810636646053. The reversal of 161810636646048 is 840646636018161.

It is a junction number, because it is equal to n+sod(n) for n = 161810636645982 and 161810636646000.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 436478688 + ... + 436849248.

It is an arithmetic number, because the mean of its divisors is an integer number (1246333408320).

Almost surely, 2^{161810636646048} 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 161810636646048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239296014397440).

161810636646048 is an abundant number, since it is smaller than the sum of its proper divisors (316781392148832).

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

161810636646048 is a wasteful number, since it uses less digits than its factorization.

161810636646048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370812 (or 370804 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 60.

The spelling of 161810636646048 in words is "one hundred sixty-one trillion, eight hundred ten billion, six hundred thirty-six million, six hundred forty-six thousand, forty-eight".