16161320368 has 40 divisors (see below), whose sum is σ = 33228565200. Its totient is φ = 7588331520.

The previous prime is 16161320363. The next prime is 16161320381. The reversal of 16161320368 is 86302316161.

It is a super-2 number, since 2×16161320368² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16161320363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55963 + ... + 188293.

It is an arithmetic number, because the mean of its divisors is an integer number (830714130).

Almost surely, 2^16161320368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16161320368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16614282600).

16161320368 is an abundant number, since it is smaller than the sum of its proper divisors (17067244832).

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

16161320368 is a wasteful number, since it uses less digits than its factorization.

16161320368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132805 (or 132799 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 16161320368 in words is "sixteen billion, one hundred sixty-one million, three hundred twenty thousand, three hundred sixty-eight".