161413636668 has 96 divisors (see below), whose sum is σ = 403141939200. Its totient is φ = 50088139776.

The previous prime is 161413636667. The next prime is 161413636687. The reversal of 161413636668 is 866636314161.

It is a super-2 number, since 2×161413636668² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 161413636668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161413636667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13491273 + ... + 13503231.

It is an arithmetic number, because the mean of its divisors is an integer number (4199395200).

Almost surely, 2^161413636668 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 161413636668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201570969600).

161413636668 is an abundant number, since it is smaller than the sum of its proper divisors (241728302532).

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

161413636668 is a wasteful number, since it uses less digits than its factorization.

161413636668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12699 (or 12697 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The spelling of 161413636668 in words is "one hundred sixty-one billion, four hundred thirteen million, six hundred thirty-six thousand, six hundred sixty-eight".