161006663 has 8 divisors (see below), whose sum is σ = 166053888. Its totient is φ = 156018744.

The previous prime is 161006641. The next prime is 161006687. The reversal of 161006663 is 366600161.

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

It is a cyclic number.

It is not a de Polignac number, because 161006663 - 2¹⁶ = 160941127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161006603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9281 + ... + 20202.

It is an arithmetic number, because the mean of its divisors is an integer number (20756736).

Almost surely, 2^161006663 is an apocalyptic number.

161006663 is a deficient number, since it is larger than the sum of its proper divisors (5047225).

161006663 is a wasteful number, since it uses less digits than its factorization.

161006663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29653.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 161006663 is about 12688.8400967149. The cubic root of 161006663 is about 544.0196871029.

The spelling of 161006663 in words is "one hundred sixty-one million, six thousand, six hundred sixty-three".