161858663 has 8 divisors (see below), whose sum is σ = 170766000. Its totient is φ = 152990208.

The previous prime is 161858651. The next prime is 161858677. The reversal of 161858663 is 366858161.

161858663 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 a cyclic number.

It is not a de Polignac number, because 161858663 - 2¹⁰ = 161857639 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 (161858623) 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, 956 + ... + 18017.

It is an arithmetic number, because the mean of its divisors is an integer number (21345750).

Almost surely, 2^161858663 is an apocalyptic number.

161858663 is a deficient number, since it is larger than the sum of its proper divisors (8907337).

161858663 is a wasteful number, since it uses less digits than its factorization.

161858663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19441.

The product of its digits is 207360, while the sum is 44.

The square root of 161858663 is about 12722.3686080855. The cubic root of 161858663 is about 544.9775969244.

The spelling of 161858663 in words is "one hundred sixty-one million, eight hundred fifty-eight thousand, six hundred sixty-three".