161589398952 has 128 divisors (see below), whose sum is σ = 433677888000. Its totient is φ = 50016994560.

The previous prime is 161589398951. The next prime is 161589398963. The reversal of 161589398952 is 259893985161.

It is a super-2 number, since 2×161589398952² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161589398951) 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, 31198299 + ... + 31203477.

It is an arithmetic number, because the mean of its divisors is an integer number (3388108500).

Almost surely, 2^161589398952 is an apocalyptic number.

161589398952 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 161589398952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216838944000).

161589398952 is an abundant number, since it is smaller than the sum of its proper divisors (272088489048).

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

161589398952 is a wasteful number, since it uses less digits than its factorization.

161589398952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551 (or 6547 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 66.

The spelling of 161589398952 in words is "one hundred sixty-one billion, five hundred eighty-nine million, three hundred ninety-eight thousand, nine hundred fifty-two".