1351425663661 has 2 divisors, whose sum is σ = 1351425663662. Its totient is φ = 1351425663660.

The previous prime is 1351425663647. The next prime is 1351425663703. The reversal of 1351425663661 is 1663665241531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 939094726761 + 412330936900 = 969069^2 + 642130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351425663661 - 2⁹ = 1351425663149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351425963661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675712831830 + 675712831831.

It is an arithmetic number, because the mean of its divisors is an integer number (675712831831).

Almost surely, 2^{1351425663661} is an apocalyptic number.

It is an amenable number.

1351425663661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351425663661 is an equidigital number, since it uses as much as digits as its factorization.

1351425663661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 49.

The spelling of 1351425663661 in words is "one trillion, three hundred fifty-one billion, four hundred twenty-five million, six hundred sixty-three thousand, six hundred sixty-one".