161500666 has 8 divisors (see below), whose sum is σ = 243399744. Its totient is φ = 80367420.

The previous prime is 161500657. The next prime is 161500711. The reversal of 161500666 is 666005161.

161500666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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, 190930 + ... + 191773.

It is an arithmetic number, because the mean of its divisors is an integer number (30424968).

Almost surely, 2^161500666 is an apocalyptic number.

161500666 is a deficient number, since it is larger than the sum of its proper divisors (81899078).

161500666 is a wasteful number, since it uses less digits than its factorization.

161500666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382916.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 161500666 is about 12708.2912305313. The cubic root of 161500666 is about 544.5755087520.

The spelling of 161500666 in words is "one hundred sixty-one million, five hundred thousand, six hundred sixty-six".