161242536424 has 24 divisors (see below), whose sum is σ = 308049887430. Its totient is φ = 79096056000.

The previous prime is 161242536397. The next prime is 161242536493. The reversal of 161242536424 is 424635242161.

It can be written as a sum of positive squares in 3 ways, for example, as 152085960324 + 9156576100 = 389982^2 + 95690^2 .

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, 8258674 + ... + 8278174.

Almost surely, 2^161242536424 is an apocalyptic number.

It is an amenable number.

161242536424 is a deficient number, since it is larger than the sum of its proper divisors (146807351006).

161242536424 is an frugal number, since it uses more digits than its factorization.

161242536424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39061 (or 19556 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

Adding to 161242536424 its reverse (424635242161), we get a palindrome (585877778585).

The spelling of 161242536424 in words is "one hundred sixty-one billion, two hundred forty-two million, five hundred thirty-six thousand, four hundred twenty-four".