161606518 has 8 divisors (see below), whose sum is σ = 242597520. Its totient is φ = 80740680.

The previous prime is 161606453. The next prime is 161606519. The reversal of 161606518 is 815606161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161606518² = 52233333320168648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606519) 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, 27993 + ... + 33268.

It is an arithmetic number, because the mean of its divisors is an integer number (30324690).

Almost surely, 2^161606518 is an apocalyptic number.

161606518 is a deficient number, since it is larger than the sum of its proper divisors (80991002).

161606518 is a wasteful number, since it uses less digits than its factorization.

161606518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62582.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 161606518 is about 12712.4552309929. The cubic root of 161606518 is about 544.6944593811.

The spelling of 161606518 in words is "one hundred sixty-one million, six hundred six thousand, five hundred eighteen".