161753436 has 168 divisors, whose sum is σ = 485869104. Its totient is φ = 46656000.

The previous prime is 161753399. The next prime is 161753437. The reversal of 161753436 is 634357161.

161753436 is a `hidden beast` number, since 1 + 617 + 5 + 3 + 4 + 36 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 161753436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161753437) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 644311 + ... + 644561.

It is an arithmetic number, because the mean of its divisors is an integer number (2892078).

Almost surely, 2^161753436 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 161753436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242934552).

161753436 is an abundant number, since it is smaller than the sum of its proper divisors (324115668).

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

161753436 is a wasteful number, since it uses less digits than its factorization.

161753436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 286 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 161753436 is about 12718.2324243583. The cubic root of 161753436 is about 544.8594716656.

The spelling of 161753436 in words is "one hundred sixty-one million, seven hundred fifty-three thousand, four hundred thirty-six".