161378168576 has 72 divisors (see below), whose sum is σ = 336350747040. Its totient is φ = 77130510336.

The previous prime is 161378168573. The next prime is 161378168591. The reversal of 161378168576 is 675861873161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161378168573) by changing a digit.

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, 9960290 + ... + 9976478.

Almost surely, 2^161378168576 is an apocalyptic number.

161378168576 is a gapful number since it is divisible by the number (16) 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 161378168576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168175373520).

161378168576 is an abundant number, since it is smaller than the sum of its proper divisors (174972578464).

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

161378168576 is a wasteful number, since it uses less digits than its factorization.

161378168576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921 (or 17907 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 59.

The spelling of 161378168576 in words is "one hundred sixty-one billion, three hundred seventy-eight million, one hundred sixty-eight thousand, five hundred seventy-six".