1727432517661 has 2 divisors, whose sum is σ = 1727432517662. Its totient is φ = 1727432517660.

The previous prime is 1727432517649. The next prime is 1727432517749. The reversal of 1727432517661 is 1667152347271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1461666492036 + 265766025625 = 1208994^2 + 515525^2 .

It is an emirp because it is prime and its reverse (1667152347271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1727432517661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1727432517599 and 1727432517608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1727432515661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 863716258830 + 863716258831.

It is an arithmetic number, because the mean of its divisors is an integer number (863716258831).

Almost surely, 2^{1727432517661} is an apocalyptic number.

It is an amenable number.

1727432517661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1727432517661 is an equidigital number, since it uses as much as digits as its factorization.

1727432517661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 52.

The spelling of 1727432517661 in words is "one trillion, seven hundred twenty-seven billion, four hundred thirty-two million, five hundred seventeen thousand, six hundred sixty-one".