161506756 has 12 divisors (see below), whose sum is σ = 284795280. Its totient is φ = 80136680.

The previous prime is 161506729. The next prime is 161506799. The reversal of 161506756 is 657605161.

161506756 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153586 + ... + 154633.

It is an arithmetic number, because the mean of its divisors is an integer number (23732940).

Almost surely, 2^161506756 is an apocalyptic number.

It is an amenable number.

161506756 is a deficient number, since it is larger than the sum of its proper divisors (123288524).

161506756 is a wasteful number, since it uses less digits than its factorization.

161506756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308354 (or 308352 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 161506756 is about 12708.5308356238. The cubic root of 161506756 is about 544.5823537665.

The spelling of 161506756 in words is "one hundred sixty-one million, five hundred six thousand, seven hundred fifty-six".