204890806429 has 2 divisors, whose sum is σ = 204890806430. Its totient is φ = 204890806428.

The previous prime is 204890806427. The next prime is 204890806433. The reversal of 204890806429 is 924608098402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193463624025 + 11427182404 = 439845^2 + 106898^2 .

It is a cyclic number.

It is not a de Polignac number, because 204890806429 - 2¹ = 204890806427 is a prime.

Together with 204890806427, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204890806427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102445403214 + 102445403215.

It is an arithmetic number, because the mean of its divisors is an integer number (102445403215).

Almost surely, 2^204890806429 is an apocalyptic number.

It is an amenable number.

204890806429 is a deficient number, since it is larger than the sum of its proper divisors (1).

204890806429 is an equidigital number, since it uses as much as digits as its factorization.

204890806429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 204890806429 in words is "two hundred four billion, eight hundred ninety million, eight hundred six thousand, four hundred twenty-nine".