1377303215681 has 2 divisors, whose sum is σ = 1377303215682. Its totient is φ = 1377303215680.

The previous prime is 1377303215677. The next prime is 1377303215737. The reversal of 1377303215681 is 1865123037731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1336067821456 + 41235394225 = 1155884^2 + 203065^2 .

It is an emirp because it is prime and its reverse (1865123037731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377303215681 - 2² = 1377303215677 is a prime.

It is a super-2 number, since 2×1377303215681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1377303211681) 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, 688651607840 + 688651607841.

It is an arithmetic number, because the mean of its divisors is an integer number (688651607841).

Almost surely, 2^{1377303215681} is an apocalyptic number.

It is an amenable number.

1377303215681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377303215681 is an equidigital number, since it uses as much as digits as its factorization.

1377303215681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 1377303215681 in words is "one trillion, three hundred seventy-seven billion, three hundred three million, two hundred fifteen thousand, six hundred eighty-one".