161005352436 has 18 divisors (see below), whose sum is σ = 406985752082. Its totient is φ = 53668450800.

The previous prime is 161005352413. The next prime is 161005352447. The reversal of 161005352436 is 634253500161.

161005352436 is a `hidden beast` number, since 1 + 610 + 0 + 5 + 3 + 5 + 2 + 4 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88102112400 + 72903240036 = 296820^2 + 270006^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×161005352436² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4472370901 = 161005352436 / (1 + 6 + 1 + 0 + 0 + 5 + 3 + 5 + 2 + 4 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 161005352436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2236185415 + ... + 2236185486.

Almost surely, 2^161005352436 is an apocalyptic number.

It is an amenable number.

161005352436 is an abundant number, since it is smaller than the sum of its proper divisors (245980399646).

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

161005352436 is a wasteful number, since it uses less digits than its factorization.

161005352436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472370911 (or 4472370906 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 161005352436 its reverse (634253500161), we get a palindrome (795258852597).

The spelling of 161005352436 in words is "one hundred sixty-one billion, five million, three hundred fifty-two thousand, four hundred thirty-six".