161697608 has 32 divisors (see below), whose sum is σ = 322133760. Its totient is φ = 75828480.

The previous prime is 161697607. The next prime is 161697611. The reversal of 161697608 is 806796161.

It is a super-2 number, since 2×161697608² = 52292232865843328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161697607) 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 7 ways as a sum of consecutive naturals, for example, 40385 + ... + 44207.

It is an arithmetic number, because the mean of its divisors is an integer number (10066680).

Almost surely, 2^161697608 is an apocalyptic number.

It is an amenable number.

161697608 is a deficient number, since it is larger than the sum of its proper divisors (160436152).

161697608 is a wasteful number, since it uses less digits than its factorization.

161697608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157 (or 4153 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 161697608 is about 12716.0374331000. The cubic root of 161697608 is about 544.7967797159.

The spelling of 161697608 in words is "one hundred sixty-one million, six hundred ninety-seven thousand, six hundred eight".