161313621316620 has 48 divisors (see below), whose sum is σ = 451725098173440. Its totient is φ = 43012493447616.

The previous prime is 161313621316583. The next prime is 161313621316643. The reversal of 161313621316620 is 26613126313161.

161313621316620 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139175452 + ... + 140329731.

It is an arithmetic number, because the mean of its divisors is an integer number (9410939545280).

Almost surely, 2^{161313621316620} is an apocalyptic number.

161313621316620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161313621316620 is an abundant number, since it is smaller than the sum of its proper divisors (290411476856820).

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

161313621316620 is a wasteful number, since it uses less digits than its factorization.

161313621316620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279514814 (or 279514812 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

Adding to 161313621316620 its reverse (26613126313161), we get a palindrome (187926747629781).

The spelling of 161313621316620 in words is "one hundred sixty-one trillion, three hundred thirteen billion, six hundred twenty-one million, three hundred sixteen thousand, six hundred twenty".