161770023 has 6 divisors (see below), whose sum is σ = 233667824. Its totient is φ = 107846676.

The previous prime is 161770019. The next prime is 161770039. The reversal of 161770023 is 320077161.

It is not a de Polignac number, because 161770023 - 2² = 161770019 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 (161770003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8987215 + ... + 8987232.

Almost surely, 2^161770023 is an apocalyptic number.

161770023 is a deficient number, since it is larger than the sum of its proper divisors (71897801).

161770023 is a wasteful number, since it uses less digits than its factorization.

161770023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17974453 (or 17974450 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 161770023 is about 12718.8845029743. The cubic root of 161770023 is about 544.8780952271.

The spelling of 161770023 in words is "one hundred sixty-one million, seven hundred seventy thousand, twenty-three".