161915109528 has 32 divisors (see below), whose sum is σ = 405797243760. Its totient is φ = 53837107200.

The previous prime is 161915109497. The next prime is 161915109541. The reversal of 161915109528 is 825901519161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8402425 + ... + 8421672.

Almost surely, 2^161915109528 is an apocalyptic number.

It is an amenable number.

161915109528 is an abundant number, since it is smaller than the sum of its proper divisors (243882134232).

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

161915109528 is a wasteful number, since it uses less digits than its factorization.

161915109528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16824507 (or 16824503 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 48.

The spelling of 161915109528 in words is "one hundred sixty-one billion, nine hundred fifteen million, one hundred nine thousand, five hundred twenty-eight".