161500510656 has 84 divisors (see below), whose sum is σ = 463290742200. Its totient is φ = 53789465088.

The previous prime is 161500510643. The next prime is 161500510681. The reversal of 161500510656 is 656015005161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161500510656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 593835 + ... + 821973.

Almost surely, 2^161500510656 is an apocalyptic number.

161500510656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161500510656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231645371100).

161500510656 is an abundant number, since it is smaller than the sum of its proper divisors (301790231544).

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

161500510656 is a wasteful number, since it uses less digits than its factorization.

161500510656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229386 (or 229373 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 161500510656 in words is "one hundred sixty-one billion, five hundred million, five hundred ten thousand, six hundred fifty-six".