856720487041 has 2 divisors, whose sum is σ = 856720487042. Its totient is φ = 856720487040.

The previous prime is 856720487003. The next prime is 856720487071. The reversal of 856720487041 is 140784027658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468430736400 + 388289750641 = 684420^2 + 623129^2 .

It is a cyclic number.

It is not a de Polignac number, because 856720487041 - 2³⁹ = 306964673153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856720487041.

It is not a weakly prime, because it can be changed into another prime (856720487071) 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, 428360243520 + 428360243521.

It is an arithmetic number, because the mean of its divisors is an integer number (428360243521).

Almost surely, 2^856720487041 is an apocalyptic number.

It is an amenable number.

856720487041 is a deficient number, since it is larger than the sum of its proper divisors (1).

856720487041 is an equidigital number, since it uses as much as digits as its factorization.

856720487041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 856720487041 in words is "eight hundred fifty-six billion, seven hundred twenty million, four hundred eighty-seven thousand, forty-one".