205842606840254 has 32 divisors (see below), whose sum is σ = 346064932746720. Its totient is φ = 91351820593152.

The previous prime is 205842606840223. The next prime is 205842606840257. The reversal of 205842606840254 is 452048606248502.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205842606840254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205842606840257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2427461339 + ... + 2427546134.

It is an arithmetic number, because the mean of its divisors is an integer number (10814529148335).

Almost surely, 2^{205842606840254} is an apocalyptic number.

205842606840254 is a deficient number, since it is larger than the sum of its proper divisors (140222325906466).

205842606840254 is a wasteful number, since it uses less digits than its factorization.

205842606840254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855007564.

The product of its (nonzero) digits is 29491200, while the sum is 56.

The spelling of 205842606840254 in words is "two hundred five trillion, eight hundred forty-two billion, six hundred six million, eight hundred forty thousand, two hundred fifty-four".