161788306944 has 320 divisors, whose sum is σ = 515049891840. Its totient is φ = 44549406720.

The previous prime is 161788306909. The next prime is 161788306949. The reversal of 161788306944 is 449603887161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161788306949) 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, 8320017 + ... + 8339439.

It is an arithmetic number, because the mean of its divisors is an integer number (1609530912).

Almost surely, 2^161788306944 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 161788306944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257524945920).

161788306944 is an abundant number, since it is smaller than the sum of its proper divisors (353261584896).

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

161788306944 is a wasteful number, since it uses less digits than its factorization.

161788306944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19501 (or 19485 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 161788306944 in words is "one hundred sixty-one billion, seven hundred eighty-eight million, three hundred six thousand, nine hundred forty-four".