161242536425 has 24 divisors (see below), whose sum is σ = 203060794200. Its totient is φ = 126996180480.

The previous prime is 161242536397. The next prime is 161242536493. The reversal of 161242536425 is 524635242161.

It can be written as a sum of positive squares in 12 ways, for example, as 12851169769 + 148391366656 = 113363^2 + 385216^2 .

It is not a de Polignac number, because 161242536425 - 2¹² = 161242532329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239381 + ... + 616269.

It is an arithmetic number, because the mean of its divisors is an integer number (8460866425).

Almost surely, 2^161242536425 is an apocalyptic number.

It is an amenable number.

161242536425 is a deficient number, since it is larger than the sum of its proper divisors (41818257775).

161242536425 is a wasteful number, since it uses less digits than its factorization.

161242536425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377165 (or 377160 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

Adding to 161242536425 its reverse (524635242161), we get a palindrome (685877778586).

The spelling of 161242536425 in words is "one hundred sixty-one billion, two hundred forty-two million, five hundred thirty-six thousand, four hundred twenty-five".