161500431536 has 20 divisors (see below), whose sum is σ = 321364035552. Its totient is φ = 78567777216.

The previous prime is 161500431529. The next prime is 161500431551. The reversal of 161500431536 is 635134005161.

It is a junction number, because it is equal to n+sod(n) for n = 161500431496 and 161500431505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136401800 + ... + 136402983.

Almost surely, 2^161500431536 is an apocalyptic number.

161500431536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161500431536 is a deficient number, since it is larger than the sum of its proper divisors (159863604016).

161500431536 is a wasteful number, since it uses less digits than its factorization.

161500431536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272804828 (or 272804822 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 161500431536 its reverse (635134005161), we get a palindrome (796634436697).

The spelling of 161500431536 in words is "one hundred sixty-one billion, five hundred million, four hundred thirty-one thousand, five hundred thirty-six".