205423400534 has 48 divisors (see below), whose sum is σ = 340142048064. Its totient is φ = 92976003120.

The previous prime is 205423400519. The next prime is 205423400561. The reversal of 205423400534 is 435004324502.

205423400534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 205423400534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61816997 + ... + 61820319.

It is an arithmetic number, because the mean of its divisors is an integer number (7086292668).

Almost surely, 2^205423400534 is an apocalyptic number.

205423400534 is a deficient number, since it is larger than the sum of its proper divisors (134718647530).

205423400534 is a wasteful number, since it uses less digits than its factorization.

205423400534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4361 (or 4350 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 32.

The spelling of 205423400534 in words is "two hundred five billion, four hundred twenty-three million, four hundred thousand, five hundred thirty-four".