756705155681 has 2 divisors, whose sum is σ = 756705155682. Its totient is φ = 756705155680.

The previous prime is 756705155653. The next prime is 756705155737. The reversal of 756705155681 is 186551507657.

It is an a-pointer prime, because the next prime (756705155737) can be obtained adding 756705155681 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724022301025 + 32682854656 = 850895^2 + 180784^2 .

It is a cyclic number.

It is not a de Polignac number, because 756705155681 - 2³⁸ = 481827248737 is a prime.

It is a super-2 number, since 2×756705155681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (756705155581) 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, 378352577840 + 378352577841.

It is an arithmetic number, because the mean of its divisors is an integer number (378352577841).

Almost surely, 2^756705155681 is an apocalyptic number.

It is an amenable number.

756705155681 is a deficient number, since it is larger than the sum of its proper divisors (1).

756705155681 is an equidigital number, since it uses as much as digits as its factorization.

756705155681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820000, while the sum is 56.

The spelling of 756705155681 in words is "seven hundred fifty-six billion, seven hundred five million, one hundred fifty-five thousand, six hundred eighty-one".