1761332557661 has 2 divisors, whose sum is σ = 1761332557662. Its totient is φ = 1761332557660.

The previous prime is 1761332557571. The next prime is 1761332557667. The reversal of 1761332557661 is 1667552331671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1748516959225 + 12815598436 = 1322315^2 + 113206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1761332557661 - 2³⁰ = 1760258815837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1761332557667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 880666278830 + 880666278831.

It is an arithmetic number, because the mean of its divisors is an integer number (880666278831).

Almost surely, 2^{1761332557661} is an apocalyptic number.

It is an amenable number.

1761332557661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1761332557661 is an equidigital number, since it uses as much as digits as its factorization.

1761332557661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800, while the sum is 53.

The spelling of 1761332557661 in words is "one trillion, seven hundred sixty-one billion, three hundred thirty-two million, five hundred fifty-seven thousand, six hundred sixty-one".