161566143252 has 96 divisors (see below), whose sum is σ = 403319734272. Its totient is φ = 50220589056.

The previous prime is 161566143217. The next prime is 161566143253. The reversal of 161566143252 is 252341665161.

161566143252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161566143252² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161566143253) 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 31 ways as a sum of consecutive naturals, for example, 3309573 + ... + 3358035.

It is an arithmetic number, because the mean of its divisors is an integer number (4201247232).

Almost surely, 2^161566143252 is an apocalyptic number.

161566143252 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 161566143252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201659867136).

161566143252 is an abundant number, since it is smaller than the sum of its proper divisors (241753591020).

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

161566143252 is a wasteful number, since it uses less digits than its factorization.

161566143252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48797 (or 48795 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The spelling of 161566143252 in words is "one hundred sixty-one billion, five hundred sixty-six million, one hundred forty-three thousand, two hundred fifty-two".