205143234451 has 2 divisors, whose sum is σ = 205143234452. Its totient is φ = 205143234450.

The previous prime is 205143234353. The next prime is 205143234467. The reversal of 205143234451 is 154432341502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205143234451 - 2¹³ = 205143226259 is a prime.

It is a super-3 number, since 3×205143234451³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (205143234481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102571617225 + 102571617226.

It is an arithmetic number, because the mean of its divisors is an integer number (102571617226).

Almost surely, 2^205143234451 is an apocalyptic number.

205143234451 is a deficient number, since it is larger than the sum of its proper divisors (1).

205143234451 is an equidigital number, since it uses as much as digits as its factorization.

205143234451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 205143234451 its reverse (154432341502), we get a palindrome (359575575953).

The spelling of 205143234451 in words is "two hundred five billion, one hundred forty-three million, two hundred thirty-four thousand, four hundred fifty-one".