161880616 has 8 divisors (see below), whose sum is σ = 303526170. Its totient is φ = 80940304.

The previous prime is 161880599. The next prime is 161880637. The reversal of 161880616 is 616088161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 137968516 + 23912100 = 11746^2 + 4890^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 10117531 + ... + 10117546.

Almost surely, 2^161880616 is an apocalyptic number.

It is an amenable number.

161880616 is a deficient number, since it is larger than the sum of its proper divisors (141645554).

161880616 is a wasteful number, since it uses less digits than its factorization.

161880616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20235083 (or 20235079 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 161880616 is about 12723.2313505650. The cubic root of 161880616 is about 545.0022343707.

The spelling of 161880616 in words is "one hundred sixty-one million, eight hundred eighty thousand, six hundred sixteen".