161012178320 has 80 divisors (see below), whose sum is σ = 442585244160. Its totient is φ = 53300577792.

The previous prime is 161012178317. The next prime is 161012178331. The reversal of 161012178320 is 23871210161.

161012178320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4941032 + ... + 4973511.

It is an arithmetic number, because the mean of its divisors is an integer number (5532315552).

Almost surely, 2^161012178320 is an apocalyptic number.

161012178320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161012178320 is an abundant number, since it is smaller than the sum of its proper divisors (281573065840).

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

161012178320 is a wasteful number, since it uses less digits than its factorization.

161012178320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9914592 (or 9914586 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

Adding to 161012178320 its reverse (23871210161), we get a palindrome (184883388481).

The spelling of 161012178320 in words is "one hundred sixty-one billion, twelve million, one hundred seventy-eight thousand, three hundred twenty".