161665496 has 16 divisors (see below), whose sum is σ = 312901440. Its totient is φ = 78225120.

The previous prime is 161665481. The next prime is 161665499. The reversal of 161665496 is 694566161.

161665496 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161665496² = 52271465193852032, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161665499) 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 3 ways as a sum of consecutive naturals, for example, 325691 + ... + 326186.

It is an arithmetic number, because the mean of its divisors is an integer number (19556340).

Almost surely, 2^161665496 is an apocalyptic number.

It is an amenable number.

161665496 is a deficient number, since it is larger than the sum of its proper divisors (151235944).

161665496 is a wasteful number, since it uses less digits than its factorization.

161665496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651914 (or 651910 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 161665496 is about 12714.7747129078. The cubic root of 161665496 is about 544.7607130673.

The spelling of 161665496 in words is "one hundred sixty-one million, six hundred sixty-five thousand, four hundred ninety-six".