1661454753241 has 2 divisors, whose sum is σ = 1661454753242. Its totient is φ = 1661454753240.

The previous prime is 1661454753191. The next prime is 1661454753269. The reversal of 1661454753241 is 1423574541661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1584839281216 + 76615472025 = 1258904^2 + 276795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661454753241 - 2¹¹ = 1661454751193 is a prime.

It is a super-2 number, since 2×1661454753241² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1661454753281) 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, 830727376620 + 830727376621.

It is an arithmetic number, because the mean of its divisors is an integer number (830727376621).

Almost surely, 2^{1661454753241} is an apocalyptic number.

It is an amenable number.

1661454753241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661454753241 is an equidigital number, since it uses as much as digits as its factorization.

1661454753241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 49.

The spelling of 1661454753241 in words is "one trillion, six hundred sixty-one billion, four hundred fifty-four million, seven hundred fifty-three thousand, two hundred forty-one".