161549728512 has 72 divisors (see below), whose sum is σ = 430545944304. Its totient is φ = 53776257024.

The previous prime is 161549728507. The next prime is 161549728559. The reversal of 161549728512 is 215827945161.

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 7 ways as a sum of consecutive naturals, for example, 419458 + ... + 706430.

It is an arithmetic number, because the mean of its divisors is an integer number (5979804782).

Almost surely, 2^161549728512 is an apocalyptic number.

161549728512 is a gapful number since it is divisible by the number (12) 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 161549728512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215272972152).

161549728512 is an abundant number, since it is smaller than the sum of its proper divisors (268996215792).

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

161549728512 is an equidigital number, since it uses as much as digits as its factorization.

161549728512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287725 (or 287711 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 51.

The spelling of 161549728512 in words is "one hundred sixty-one billion, five hundred forty-nine million, seven hundred twenty-eight thousand, five hundred twelve".