205426263073 has 4 divisors (see below), whose sum is σ = 206469036180. Its totient is φ = 204383489968.

The previous prime is 205426263037. The next prime is 205426263083. The reversal of 205426263073 is 370362624502.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 201585734289 + 3840528784 = 448983^2 + 61972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205426263073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205426263013) 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, 521386258 + ... + 521386651.

It is an arithmetic number, because the mean of its divisors is an integer number (51617259045).

Almost surely, 2^205426263073 is an apocalyptic number.

It is an amenable number.

205426263073 is a deficient number, since it is larger than the sum of its proper divisors (1042773107).

205426263073 is a wasteful number, since it uses less digits than its factorization.

205426263073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042773106.

The product of its (nonzero) digits is 362880, while the sum is 40.

Adding to 205426263073 its reverse (370362624502), we get a palindrome (575788887575).

The spelling of 205426263073 in words is "two hundred five billion, four hundred twenty-six million, two hundred sixty-three thousand, seventy-three".