204264132581 has 2 divisors, whose sum is σ = 204264132582. Its totient is φ = 204264132580.

The previous prime is 204264132469. The next prime is 204264132593. The reversal of 204264132581 is 185231462402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163486792225 + 40777340356 = 404335^2 + 201934^2 .

It is a cyclic number.

It is not a de Polignac number, because 204264132581 - 2¹⁴ = 204264116197 is a prime.

It is a super-2 number, since 2×204264132581² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204264132781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102132066290 + 102132066291.

It is an arithmetic number, because the mean of its divisors is an integer number (102132066291).

Almost surely, 2^204264132581 is an apocalyptic number.

It is an amenable number.

204264132581 is a deficient number, since it is larger than the sum of its proper divisors (1).

204264132581 is an equidigital number, since it uses as much as digits as its factorization.

204264132581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 38.

Adding to 204264132581 its reverse (185231462402), we get a palindrome (389495594983).

The spelling of 204264132581 in words is "two hundred four billion, two hundred sixty-four million, one hundred thirty-two thousand, five hundred eighty-one".