205423456165 has 8 divisors (see below), whose sum is σ = 249980093568. Its totient is φ = 162024134160.

The previous prime is 205423456141. The next prime is 205423456177. The reversal of 205423456165 is 561654324502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205423456165 - 2¹⁹ = 205422931877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289328457 + ... + 289329166.

It is an arithmetic number, because the mean of its divisors is an integer number (31247511696).

Almost surely, 2^205423456165 is an apocalyptic number.

It is an amenable number.

205423456165 is a deficient number, since it is larger than the sum of its proper divisors (44556637403).

205423456165 is an equidigital number, since it uses as much as digits as its factorization.

205423456165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578657699.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 205423456165 in words is "two hundred five billion, four hundred twenty-three million, four hundred fifty-six thousand, one hundred sixty-five".