161998524 has 36 divisors (see below), whose sum is σ = 423619560. Its totient is φ = 52137120.

The previous prime is 161998511. The next prime is 161998531. The reversal of 161998524 is 425899161.

161998524 is a `hidden beast` number, since 1 + 619 + 9 + 8 + 5 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161998524.

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, 76542 + ... + 78629.

It is an arithmetic number, because the mean of its divisors is an integer number (11767210).

Almost surely, 2^161998524 is an apocalyptic number.

It is an amenable number.

161998524 is an abundant number, since it is smaller than the sum of its proper divisors (261621036).

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

161998524 is a wasteful number, since it uses less digits than its factorization.

161998524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155210 (or 155205 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 161998524 is about 12727.8640784697. The cubic root of 161998524 is about 545.1345222459.

The spelling of 161998524 in words is "one hundred sixty-one million, nine hundred ninety-eight thousand, five hundred twenty-four".