161320829640 has 64 divisors (see below), whose sum is σ = 484337828160. Its totient is φ = 42985524480.

The previous prime is 161320829629. The next prime is 161320829669. The reversal of 161320829640 is 46928023161.

161320829640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161320829592 and 161320829601.

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 15 ways as a sum of consecutive naturals, for example, 365739 + ... + 675578.

It is an arithmetic number, because the mean of its divisors is an integer number (7567778565).

Almost surely, 2^161320829640 is an apocalyptic number.

161320829640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161320829640 is an abundant number, since it is smaller than the sum of its proper divisors (323016998520).

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

161320829640 is a wasteful number, since it uses less digits than its factorization.

161320829640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042622 (or 1042618 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 161320829640 in words is "one hundred sixty-one billion, three hundred twenty million, eight hundred twenty-nine thousand, six hundred forty".