827685150781 has 2 divisors, whose sum is σ = 827685150782. Its totient is φ = 827685150780.

The previous prime is 827685150767. The next prime is 827685150839. The reversal of 827685150781 is 187051586728.

It is an a-pointer prime, because the next prime (827685150839) can be obtained adding 827685150781 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 823284022500 + 4401128281 = 907350^2 + 66341^2 .

It is a cyclic number.

It is not a de Polignac number, because 827685150781 - 2⁵ = 827685150749 is a prime.

It is a super-2 number, since 2×827685150781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827685150731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413842575390 + 413842575391.

It is an arithmetic number, because the mean of its divisors is an integer number (413842575391).

Almost surely, 2^827685150781 is an apocalyptic number.

It is an amenable number.

827685150781 is a deficient number, since it is larger than the sum of its proper divisors (1).

827685150781 is an equidigital number, since it uses as much as digits as its factorization.

827685150781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7526400, while the sum is 58.

The spelling of 827685150781 in words is "eight hundred twenty-seven billion, six hundred eighty-five million, one hundred fifty thousand, seven hundred eighty-one".