205143242264123 has 4 divisors (see below), whose sum is σ = 208506246235728. Its totient is φ = 201780238292520.

The previous prime is 205143242264113. The next prime is 205143242264137. The reversal of 205143242264123 is 321462242341502.

205143242264123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205143242264123 is a prime.

It is a super-2 number, since 2×205143242264123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205143242264113) 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, 1681501985711 + ... + 1681501985832.

It is an arithmetic number, because the mean of its divisors is an integer number (52126561558932).

Almost surely, 2^{205143242264123} is an apocalyptic number.

205143242264123 is a deficient number, since it is larger than the sum of its proper divisors (3363003971605).

205143242264123 is an equidigital number, since it uses as much as digits as its factorization.

205143242264123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363003971604.

The product of its (nonzero) digits is 552960, while the sum is 41.

The spelling of 205143242264123 in words is "two hundred five trillion, one hundred forty-three billion, two hundred forty-two million, two hundred sixty-four thousand, one hundred twenty-three".