161500555594 has 48 divisors (see below), whose sum is σ = 302466183048. Its totient is φ = 64250661888.

The previous prime is 161500555583. The next prime is 161500555613. The reversal of 161500555594 is 495555005161.

161500555594 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 140486284225 + 21014271369 = 374815^2 + 144963^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 542349 + ... + 785584.

Almost surely, 2^161500555594 is an apocalyptic number.

161500555594 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161500555594 is a deficient number, since it is larger than the sum of its proper divisors (140965627454).

161500555594 is a wasteful number, since it uses less digits than its factorization.

161500555594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328039 (or 1328032 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 161500555594 in words is "one hundred sixty-one billion, five hundred million, five hundred fifty-five thousand, five hundred ninety-four".