1351661877869 has 2 divisors, whose sum is σ = 1351661877870. Its totient is φ = 1351661877868.

The previous prime is 1351661877809. The next prime is 1351661877911. The reversal of 1351661877869 is 9687781661531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 869345517769 + 482316360100 = 932387^2 + 694490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351661877869 - 2³² = 1347366910573 is a prime.

It is a super-2 number, since 2×1351661877869² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1351661877799 and 1351661877808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351661877809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675830938934 + 675830938935.

It is an arithmetic number, because the mean of its divisors is an integer number (675830938935).

Almost surely, 2^{1351661877869} is an apocalyptic number.

It is an amenable number.

1351661877869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351661877869 is an equidigital number, since it uses as much as digits as its factorization.

1351661877869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 68.

The spelling of 1351661877869 in words is "one trillion, three hundred fifty-one billion, six hundred sixty-one million, eight hundred seventy-seven thousand, eight hundred sixty-nine".