161381147136 has 320 divisors, whose sum is σ = 492177641472. Its totient is φ = 46540800000.

The previous prime is 161381147029. The next prime is 161381147143. The reversal of 161381147136 is 631741183161.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31947811 + ... + 31952861.

Almost surely, 2^161381147136 is an apocalyptic number.

161381147136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161381147136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246088820736).

161381147136 is an abundant number, since it is smaller than the sum of its proper divisors (330796494336).

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

161381147136 is a wasteful number, since it uses less digits than its factorization.

161381147136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175 (or 5159 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The spelling of 161381147136 in words is "one hundred sixty-one billion, three hundred eighty-one million, one hundred forty-seven thousand, one hundred thirty-six".