161307713252 has 144 divisors (see below), whose sum is σ = 338216659200. Its totient is φ = 67100866560.

The previous prime is 161307713239. The next prime is 161307713257. The reversal of 161307713252 is 252317703161.

It is a happy number.

161307713252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161307713257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 316910774 + ... + 316911282.

It is an arithmetic number, because the mean of its divisors is an integer number (2348726800).

Almost surely, 2^161307713252 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 161307713252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169108329600).

161307713252 is an abundant number, since it is smaller than the sum of its proper divisors (176908945948).

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

161307713252 is a wasteful number, since it uses less digits than its factorization.

161307713252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 161307713252 in words is "one hundred sixty-one billion, three hundred seven million, seven hundred thirteen thousand, two hundred fifty-two".