1277876387881 has 2 divisors, whose sum is σ = 1277876387882. Its totient is φ = 1277876387880.

The previous prime is 1277876387861. The next prime is 1277876387917. The reversal of 1277876387881 is 1887836787721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089746000281 + 188130387600 = 1043909^2 + 433740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277876387881 - 2¹⁵ = 1277876355113 is a prime.

It is a super-2 number, since 2×1277876387881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1277876387861) 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, 638938193940 + 638938193941.

It is an arithmetic number, because the mean of its divisors is an integer number (638938193941).

Almost surely, 2^{1277876387881} is an apocalyptic number.

It is an amenable number.

1277876387881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277876387881 is an equidigital number, since it uses as much as digits as its factorization.

1277876387881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 354041856, while the sum is 73.

The spelling of 1277876387881 in words is "one trillion, two hundred seventy-seven billion, eight hundred seventy-six million, three hundred eighty-seven thousand, eight hundred eighty-one".