161305650 has 72 divisors (see below), whose sum is σ = 472786704. Its totient is φ = 39103200.

The previous prime is 161305591. The next prime is 161305657. The reversal of 161305650 is 56503161.

It is a happy number.

161305650 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 0 + 5 + 650 = 666.

It is not an unprimeable number, because it can be changed into a prime (161305657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11344 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (6566482).

Almost surely, 2^161305650 is an apocalyptic number.

161305650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161305650 is an abundant number, since it is smaller than the sum of its proper divisors (311481054).

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

161305650 is a wasteful number, since it uses less digits than its factorization.

161305650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32616 (or 32608 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 161305650 is about 12700.6161267869. The cubic root of 161305650 is about 544.3562243873.

The spelling of 161305650 in words is "one hundred sixty-one million, three hundred five thousand, six hundred fifty".