773215996681 has 2 divisors, whose sum is σ = 773215996682. Its totient is φ = 773215996680.

The previous prime is 773215996613. The next prime is 773215996711. The reversal of 773215996681 is 186699512377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561137326281 + 212078670400 = 749091^2 + 460520^2 .

It is a cyclic number.

It is not a de Polignac number, because 773215996681 - 2²⁹ = 772679125769 is a prime.

It is a super-2 number, since 2×773215996681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (773215946681) 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, 386607998340 + 386607998341.

It is an arithmetic number, because the mean of its divisors is an integer number (386607998341).

Almost surely, 2^773215996681 is an apocalyptic number.

It is an amenable number.

773215996681 is a deficient number, since it is larger than the sum of its proper divisors (1).

773215996681 is an equidigital number, since it uses as much as digits as its factorization.

773215996681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160, while the sum is 64.

The spelling of 773215996681 in words is "seven hundred seventy-three billion, two hundred fifteen million, nine hundred ninety-six thousand, six hundred eighty-one".