28581925823261 has 2 divisors, whose sum is σ = 28581925823262. Its totient is φ = 28581925823260.

The previous prime is 28581925823197. The next prime is 28581925823329. The reversal of 28581925823261 is 16232852918582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25673161463161 + 2908764360100 = 5066869^2 + 1705510^2 .

It is a cyclic number.

It is not a de Polignac number, because 28581925823261 - 2⁶ = 28581925823197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28581925823194 and 28581925823203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28581955823261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14290962911630 + 14290962911631.

It is an arithmetic number, because the mean of its divisors is an integer number (14290962911631).

Almost surely, 2^{28581925823261} is an apocalyptic number.

It is an amenable number.

28581925823261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28581925823261 is an equidigital number, since it uses as much as digits as its factorization.

28581925823261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33177600, while the sum is 62.

The spelling of 28581925823261 in words is "twenty-eight trillion, five hundred eighty-one billion, nine hundred twenty-five million, eight hundred twenty-three thousand, two hundred sixty-one".