161201566434 has 64 divisors (see below), whose sum is σ = 344489739264. Its totient is φ = 50166532416.

The previous prime is 161201566433. The next prime is 161201566439. The reversal of 161201566434 is 434665102161.

It is a junction number, because it is equal to n+sod(n) for n = 161201566392 and 161201566401.

It is not an unprimeable number, because it can be changed into a prime (161201566433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9028564 + ... + 9046400.

It is an arithmetic number, because the mean of its divisors is an integer number (5382652176).

Almost surely, 2^161201566434 is an apocalyptic number.

161201566434 is an abundant number, since it is smaller than the sum of its proper divisors (183288172830).

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

161201566434 is a wasteful number, since it uses less digits than its factorization.

161201566434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19431.

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 161201566434 its reverse (434665102161), we get a palindrome (595866668595).

The spelling of 161201566434 in words is "one hundred sixty-one billion, two hundred one million, five hundred sixty-six thousand, four hundred thirty-four".