161303516550 has 144 divisors (see below), whose sum is σ = 500575965552. Its totient is φ = 36803635200.

The previous prime is 161303516527. The next prime is 161303516609. The reversal of 161303516550 is 55615303161.

161303516550 is a `hidden beast` number, since 1 + 6 + 130 + 3 + 516 + 5 + 5 + 0 = 666.

It is a super-2 number, since 2×161303516550² (a number of 23 digits) contains 22 as substring.

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 71 ways as a sum of consecutive naturals, for example, 874279 + ... + 1042578.

It is an arithmetic number, because the mean of its divisors is an integer number (3476221983).

Almost surely, 2^161303516550 is an apocalyptic number.

161303516550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161303516550 is an abundant number, since it is smaller than the sum of its proper divisors (339272449002).

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

161303516550 is a wasteful number, since it uses less digits than its factorization.

161303516550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916903 (or 1916895 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 161303516550 in words is "one hundred sixty-one billion, three hundred three million, five hundred sixteen thousand, five hundred fifty".