766191803281 has 2 divisors, whose sum is σ = 766191803282. Its totient is φ = 766191803280.

The previous prime is 766191803257. The next prime is 766191803287. The reversal of 766191803281 is 182308191667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431511041025 + 334680762256 = 656895^2 + 578516^2 .

It is a cyclic number.

It is not a de Polignac number, because 766191803281 - 2⁵ = 766191803249 is a prime.

It is a super-2 number, since 2×766191803281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (766191803287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383095901640 + 383095901641.

It is an arithmetic number, because the mean of its divisors is an integer number (383095901641).

Almost surely, 2^766191803281 is an apocalyptic number.

It is an amenable number.

766191803281 is a deficient number, since it is larger than the sum of its proper divisors (1).

766191803281 is an equidigital number, since it uses as much as digits as its factorization.

766191803281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 766191803281 in words is "seven hundred sixty-six billion, one hundred ninety-one million, eight hundred three thousand, two hundred eighty-one".