161998725574 has 16 divisors (see below), whose sum is σ = 278426023200. Its totient is φ = 69249544704.

The previous prime is 161998725557. The next prime is 161998725601. The reversal of 161998725574 is 475527899161.

161998725574 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 14867739 + ... + 14878630.

It is an arithmetic number, because the mean of its divisors is an integer number (17401626450).

Almost surely, 2^161998725574 is an apocalyptic number.

161998725574 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161998725574 is a deficient number, since it is larger than the sum of its proper divisors (116427297626).

161998725574 is a wasteful number, since it uses less digits than its factorization.

161998725574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29746767.

The product of its digits is 38102400, while the sum is 64.

The spelling of 161998725574 in words is "one hundred sixty-one billion, nine hundred ninety-eight million, seven hundred twenty-five thousand, five hundred seventy-four".