161335404053121 has 16 divisors (see below), whose sum is σ = 222784999077888. Its totient is φ = 103785835784400.

The previous prime is 161335404053107. The next prime is 161335404053249. The reversal of 161335404053121 is 121350404533161.

It is not a de Polignac number, because 161335404053121 - 2¹⁹ = 161335403528833 is a prime.

It is a super-2 number, since 2×161335404053121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161335404053121.

It is not an unprimeable number, because it can be changed into a prime (161335404053821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8057896495 + ... + 8057916516.

It is an arithmetic number, because the mean of its divisors is an integer number (13924062442368).

Almost surely, 2^{161335404053121} is an apocalyptic number.

It is an amenable number.

161335404053121 is a deficient number, since it is larger than the sum of its proper divisors (61449595024767).

161335404053121 is a wasteful number, since it uses less digits than its factorization.

161335404053121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16115813132.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 161335404053121 its reverse (121350404533161), we get a palindrome (282685808586282).

The spelling of 161335404053121 in words is "one hundred sixty-one trillion, three hundred thirty-five billion, four hundred four million, fifty-three thousand, one hundred twenty-one".