161728690752 has 336 divisors, whose sum is σ = 486549752832. Its totient is φ = 51312476160.

The previous prime is 161728690703. The next prime is 161728690757. The reversal of 161728690752 is 257096827161.

It is not an unprimeable number, because it can be changed into a prime (161728690757) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 272729368 + ... + 272729960.

Almost surely, 2^161728690752 is an apocalyptic number.

161728690752 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 161728690752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243274876416).

161728690752 is an abundant number, since it is smaller than the sum of its proper divisors (324821062080).

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

161728690752 is a wasteful number, since it uses less digits than its factorization.

161728690752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 161728690752 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, six hundred ninety thousand, seven hundred fifty-two".