205804364413 has 2 divisors, whose sum is σ = 205804364414. Its totient is φ = 205804364412.

The previous prime is 205804364371. The next prime is 205804364419. The reversal of 205804364413 is 314463408502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194187404889 + 11616959524 = 440667^2 + 107782^2 .

It is a cyclic number.

It is not a de Polignac number, because 205804364413 - 2²¹ = 205802267261 is a prime.

It is a super-2 number, since 2×205804364413² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205804364419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102902182206 + 102902182207.

It is an arithmetic number, because the mean of its divisors is an integer number (102902182207).

Almost surely, 2^205804364413 is an apocalyptic number.

It is an amenable number.

205804364413 is a deficient number, since it is larger than the sum of its proper divisors (1).

205804364413 is an equidigital number, since it uses as much as digits as its factorization.

205804364413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 205804364413 in words is "two hundred five billion, eight hundred four million, three hundred sixty-four thousand, four hundred thirteen".