161578616 has 16 divisors (see below), whose sum is σ = 304090200. Its totient is φ = 80487904.

The previous prime is 161578597. The next prime is 161578619. The reversal of 161578616 is 616875161.

It is a super-2 number, since 2×161578616² = 52215298296950912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161578619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35390 + ... + 39693.

Almost surely, 2^161578616 is an apocalyptic number.

It is an amenable number.

161578616 is a deficient number, since it is larger than the sum of its proper divisors (142511584).

161578616 is a wasteful number, since it uses less digits than its factorization.

161578616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75358 (or 75354 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 161578616 is about 12711.3577559598. The cubic root of 161578616 is about 544.6631096976.

The spelling of 161578616 in words is "one hundred sixty-one million, five hundred seventy-eight thousand, six hundred sixteen".