161969544 has 160 divisors (see below), whose sum is σ = 511568640. Its totient is φ = 47433600.

The previous prime is 161969501. The next prime is 161969569. The reversal of 161969544 is 445969161.

It is a happy number.

161969544 is a `hidden beast` number, since 16 + 1 + 96 + 9 + 544 = 666.

161969544 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-3 number, since 3×161969544³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161969544.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 220602 + ... + 221334.

It is an arithmetic number, because the mean of its divisors is an integer number (3197304).

Almost surely, 2^161969544 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 161969544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255784320).

161969544 is an abundant number, since it is smaller than the sum of its proper divisors (349599096).

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

161969544 is a wasteful number, since it uses less digits than its factorization.

161969544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 780 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 161969544 is about 12726.7255804468. The cubic root of 161969544 is about 545.1020138415.

The spelling of 161969544 in words is "one hundred sixty-one million, nine hundred sixty-nine thousand, five hundred forty-four".