161243523072 has 384 divisors, whose sum is σ = 500142988800. Its totient is φ = 51273990144.

The previous prime is 161243523059. The next prime is 161243523073. The reversal of 161243523072 is 270325342161.

161243523072 is a `hidden beast` number, since 1 + 6 + 124 + 3 + 523 + 0 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161243523073) 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, 108434713 + ... + 108436199.

It is an arithmetic number, because the mean of its divisors is an integer number (1302455700).

Almost surely, 2^161243523072 is an apocalyptic number.

161243523072 is a gapful number since it is divisible by the number (12) 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 161243523072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250071494400).

161243523072 is an abundant number, since it is smaller than the sum of its proper divisors (338899465728).

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

161243523072 is a wasteful number, since it uses less digits than its factorization.

161243523072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 161243523072 in words is "one hundred sixty-one billion, two hundred forty-three million, five hundred twenty-three thousand, seventy-two".