205626570013 has 4 divisors (see below), whose sum is σ = 217722250620. Its totient is φ = 193530889408.

The previous prime is 205626569971. The next prime is 205626570073. The reversal of 205626570013 is 310075626502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310075626502 = 2 ⋅155037813251.

It can be written as a sum of positive squares in 2 ways, for example, as 68621469849 + 137005100164 = 261957^2 + 370142^2 .

It is a cyclic number.

It is not a de Polignac number, because 205626570013 - 2¹³ = 205626561821 is a prime.

It is a super-2 number, since 2×205626570013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205626570073) 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, 6047840278 + ... + 6047840311.

It is an arithmetic number, because the mean of its divisors is an integer number (54430562655).

Almost surely, 2^205626570013 is an apocalyptic number.

It is an amenable number.

205626570013 is a deficient number, since it is larger than the sum of its proper divisors (12095680607).

205626570013 is a wasteful number, since it uses less digits than its factorization.

205626570013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095680606.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 205626570013 in words is "two hundred five billion, six hundred twenty-six million, five hundred seventy thousand, thirteen".