161397306216 has 160 divisors (see below), whose sum is σ = 482559422400. Its totient is φ = 50249445120.

The previous prime is 161397306181. The next prime is 161397306251. The reversal of 161397306216 is 612603793161.

It is a happy number.

161397306216 is a `hidden beast` number, since 1 + 6 + 13 + 9 + 7 + 3 + 0 + 621 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (161397306181) and next prime (161397306251).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 781836 + ... + 966468.

It is an arithmetic number, because the mean of its divisors is an integer number (3015996390).

Almost surely, 2^161397306216 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 161397306216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241279711200).

161397306216 is an abundant number, since it is smaller than the sum of its proper divisors (321162116184).

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

161397306216 is a wasteful number, since it uses less digits than its factorization.

161397306216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184741 (or 184728 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 161397306216 in words is "one hundred sixty-one billion, three hundred ninety-seven million, three hundred six thousand, two hundred sixteen".