161416623605 has 4 divisors (see below), whose sum is σ = 193699948332. Its totient is φ = 129133298880.

The previous prime is 161416623523. The next prime is 161416623607. The reversal of 161416623605 is 506326614161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20577041809 + 140839581796 = 143447^2 + 375286^2 .

It is not a de Polignac number, because 161416623605 - 2²⁶ = 161349514741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161416623607) 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, 16141662356 + ... + 16141662365.

It is an arithmetic number, because the mean of its divisors is an integer number (48424987083).

Almost surely, 2^161416623605 is an apocalyptic number.

It is an amenable number.

161416623605 is a deficient number, since it is larger than the sum of its proper divisors (32283324727).

161416623605 is an equidigital number, since it uses as much as digits as its factorization.

161416623605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32283324726.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 161416623605 in words is "one hundred sixty-one billion, four hundred sixteen million, six hundred twenty-three thousand, six hundred five".