161545623 has 4 divisors (see below), whose sum is σ = 215394168. Its totient is φ = 107697080.

The previous prime is 161545603. The next prime is 161545633. The reversal of 161545623 is 326545161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326545161 = 3 ⋅108848387.

It is a cyclic number.

It is not a de Polignac number, because 161545623 - 2¹⁴ = 161529239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161545603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26924268 + ... + 26924273.

It is an arithmetic number, because the mean of its divisors is an integer number (53848542).

Almost surely, 2^161545623 is an apocalyptic number.

161545623 is a deficient number, since it is larger than the sum of its proper divisors (53848545).

161545623 is an equidigital number, since it uses as much as digits as its factorization.

161545623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53848544.

The product of its digits is 21600, while the sum is 33.

The square root of 161545623 is about 12710.0599133128. The cubic root of 161545623 is about 544.6260352924.

The spelling of 161545623 in words is "one hundred sixty-one million, five hundred forty-five thousand, six hundred twenty-three".