205654365023 has 4 divisors (see below), whose sum is σ = 206916048408. Its totient is φ = 204392681640.

The previous prime is 205654365001. The next prime is 205654365061. The reversal of 205654365023 is 320563456502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320563456502 = 2 ⋅160281728251.

It is a cyclic number.

It is not a de Polignac number, because 205654365023 - 2¹⁴ = 205654348639 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 (205654364023) 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, 630841448 + ... + 630841773.

It is an arithmetic number, because the mean of its divisors is an integer number (51729012102).

Almost surely, 2^205654365023 is an apocalyptic number.

205654365023 is a deficient number, since it is larger than the sum of its proper divisors (1261683385).

205654365023 is a wasteful number, since it uses less digits than its factorization.

205654365023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261683384.

The product of its (nonzero) digits is 648000, while the sum is 41.

The spelling of 205654365023 in words is "two hundred five billion, six hundred fifty-four million, three hundred sixty-five thousand, twenty-three".