204423552491 has 2 divisors, whose sum is σ = 204423552492. Its totient is φ = 204423552490.

The previous prime is 204423552481. The next prime is 204423552547. The reversal of 204423552491 is 194255324402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204423552491 is a prime.

It is not a weakly prime, because it can be changed into another prime (204423552451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102211776245 + 102211776246.

It is an arithmetic number, because the mean of its divisors is an integer number (102211776246).

Almost surely, 2^204423552491 is an apocalyptic number.

204423552491 is a deficient number, since it is larger than the sum of its proper divisors (1).

204423552491 is an equidigital number, since it uses as much as digits as its factorization.

204423552491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 204423552491 its reverse (194255324402), we get a palindrome (398678876893).

The spelling of 204423552491 in words is "two hundred four billion, four hundred twenty-three million, five hundred fifty-two thousand, four hundred ninety-one".