205307100073 has 4 divisors (see below), whose sum is σ = 205397585860. Its totient is φ = 205216614288.

The previous prime is 205307099993. The next prime is 205307100079. The reversal of 205307100073 is 370001703502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370001703502 = 2 ⋅185000851751.

It can be written as a sum of positive squares in 2 ways, for example, as 11774854144 + 193532245929 = 108512^2 + 439923^2 .

It is a cyclic number.

It is not a de Polignac number, because 205307100073 - 2²¹ = 205305002921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205307100079) 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, 45239490 + ... + 45244027.

It is an arithmetic number, because the mean of its divisors is an integer number (51349396465).

Almost surely, 2^205307100073 is an apocalyptic number.

It is an amenable number.

205307100073 is a deficient number, since it is larger than the sum of its proper divisors (90485787).

205307100073 is an equidigital number, since it uses as much as digits as its factorization.

205307100073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90485786.

The product of its (nonzero) digits is 4410, while the sum is 28.

Adding to 205307100073 its reverse (370001703502), we get a palindrome (575308803575).

The spelling of 205307100073 in words is "two hundred five billion, three hundred seven million, one hundred thousand, seventy-three".