161366316220 has 24 divisors (see below), whose sum is σ = 338879646000. Its totient is φ = 64544548992.

The previous prime is 161366316211. The next prime is 161366316311. The reversal of 161366316220 is 22613663161.

It is a self number, because there is not a number n which added to its sum of digits gives 161366316220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669736 + ... + 878224.

It is an arithmetic number, because the mean of its divisors is an integer number (14119985250).

Almost surely, 2^161366316220 is an apocalyptic number.

161366316220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161366316220 is an abundant number, since it is smaller than the sum of its proper divisors (177513329780).

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

161366316220 is a wasteful number, since it uses less digits than its factorization.

161366316220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247197 (or 247195 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

Adding to 161366316220 its reverse (22613663161), we get a palindrome (183979979381).

The spelling of 161366316220 in words is "one hundred sixty-one billion, three hundred sixty-six million, three hundred sixteen thousand, two hundred twenty".