161973987160 has 64 divisors (see below), whose sum is σ = 368882359200. Its totient is φ = 64001473536.

The previous prime is 161973987157. The next prime is 161973987163. The reversal of 161973987160 is 61789379161.

161973987160 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161973987157) and next prime (161973987163).

It is a junction number, because it is equal to n+sod(n) for n = 161973987095 and 161973987104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161973987163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3870267 + ... + 3911893.

Almost surely, 2^161973987160 is an apocalyptic number.

161973987160 is a gapful number since it is divisible by the number (10) 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 161973987160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184441179600).

161973987160 is an abundant number, since it is smaller than the sum of its proper divisors (206908372040).

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

161973987160 is a wasteful number, since it uses less digits than its factorization.

161973987160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42820 (or 42816 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 58.

The spelling of 161973987160 in words is "one hundred sixty-one billion, nine hundred seventy-three million, nine hundred eighty-seven thousand, one hundred sixty".