161620066 has 8 divisors (see below), whose sum is σ = 242502480. Its totient is φ = 80785908.

The previous prime is 161620021. The next prime is 161620087. The reversal of 161620066 is 660026161.

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

It is a super-2 number, since 2×161620066² = 52242091467688712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016 + ... + 18091.

It is an arithmetic number, because the mean of its divisors is an integer number (30312810).

Almost surely, 2^161620066 is an apocalyptic number.

161620066 is a deficient number, since it is larger than the sum of its proper divisors (80882414).

161620066 is a wasteful number, since it uses less digits than its factorization.

161620066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24128.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 161620066 is about 12712.9880830590. The cubic root of 161620066 is about 544.7096801251.

The spelling of 161620066 in words is "one hundred sixty-one million, six hundred twenty thousand, sixty-six".