10781250825581 has 2 divisors, whose sum is σ = 10781250825582. Its totient is φ = 10781250825580.

The previous prime is 10781250825571. The next prime is 10781250825589. The reversal of 10781250825581 is 18552805218701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10551881669956 + 229369155625 = 3248366^2 + 478925^2 .

It is a cyclic number.

It is not a de Polignac number, because 10781250825581 - 2¹⁸ = 10781250563437 is a prime.

It is a super-2 number, since 2×10781250825581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10781250825589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5390625412790 + 5390625412791.

It is an arithmetic number, because the mean of its divisors is an integer number (5390625412791).

Almost surely, 2^{10781250825581} is an apocalyptic number.

It is an amenable number.

10781250825581 is a deficient number, since it is larger than the sum of its proper divisors (1).

10781250825581 is an equidigital number, since it uses as much as digits as its factorization.

10781250825581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792000, while the sum is 53.

The spelling of 10781250825581 in words is "ten trillion, seven hundred eighty-one billion, two hundred fifty million, eight hundred twenty-five thousand, five hundred eighty-one".