1377965422781 has 2 divisors, whose sum is σ = 1377965422782. Its totient is φ = 1377965422780.

The previous prime is 1377965422763. The next prime is 1377965422789. The reversal of 1377965422781 is 1872245697731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1231065697156 + 146899725625 = 1109534^2 + 383275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377965422781 - 2³⁴ = 1360785553597 is a prime.

It is a super-2 number, since 2×1377965422781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377965422789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688982711390 + 688982711391.

It is an arithmetic number, because the mean of its divisors is an integer number (688982711391).

Almost surely, 2^{1377965422781} is an apocalyptic number.

It is an amenable number.

1377965422781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377965422781 is an equidigital number, since it uses as much as digits as its factorization.

1377965422781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35562240, while the sum is 62.

The spelling of 1377965422781 in words is "one trillion, three hundred seventy-seven billion, nine hundred sixty-five million, four hundred twenty-two thousand, seven hundred eighty-one".