161650623 has 4 divisors (see below), whose sum is σ = 215534168. Its totient is φ = 107767080.

The previous prime is 161650607. The next prime is 161650627. The reversal of 161650623 is 326056161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326056161 = 3 ⋅108685387.

It is not a de Polignac number, because 161650623 - 2⁴ = 161650607 is a prime.

It is a super-2 number, since 2×161650623² = 52261847832576258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161650627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26941768 + ... + 26941773.

It is an arithmetic number, because the mean of its divisors is an integer number (53883542).

Almost surely, 2^161650623 is an apocalyptic number.

161650623 is a deficient number, since it is larger than the sum of its proper divisors (53883545).

161650623 is an equidigital number, since it uses as much as digits as its factorization.

161650623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53883544.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 161650623 is about 12714.1898286914. The cubic root of 161650623 is about 544.7440068133.

The spelling of 161650623 in words is "one hundred sixty-one million, six hundred fifty thousand, six hundred twenty-three".