276685839877781 has 2 divisors, whose sum is σ = 276685839877782. Its totient is φ = 276685839877780.

The previous prime is 276685839877763. The next prime is 276685839877883. The reversal of 276685839877781 is 187778938586672.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221475144325681 + 55210695552100 = 14882041^2 + 7430390^2 .

It is a cyclic number.

It is not a de Polignac number, because 276685839877781 - 2¹⁸ = 276685839615637 is a prime.

It is a super-2 number, since 2×276685839877781² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (276685839867781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138342919938890 + 138342919938891.

It is an arithmetic number, because the mean of its divisors is an integer number (138342919938891).

Almost surely, 2^{276685839877781} is an apocalyptic number.

It is an amenable number.

276685839877781 is a deficient number, since it is larger than the sum of its proper divisors (1).

276685839877781 is an equidigital number, since it uses as much as digits as its factorization.

276685839877781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95591301120, while the sum is 92.

The spelling of 276685839877781 in words is "two hundred seventy-six trillion, six hundred eighty-five billion, eight hundred thirty-nine million, eight hundred seventy-seven thousand, seven hundred eighty-one".