61746613661 has 2 divisors, whose sum is σ = 61746613662. Its totient is φ = 61746613660.

The previous prime is 61746613571. The next prime is 61746613667. The reversal of 61746613661 is 16631664716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56789749636 + 4956864025 = 238306^2 + 70405^2 .

It is a cyclic number.

It is not a de Polignac number, because 61746613661 - 2¹⁰ = 61746612637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61746613667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30873306830 + 30873306831.

It is an arithmetic number, because the mean of its divisors is an integer number (30873306831).

Almost surely, 2^61746613661 is an apocalyptic number.

It is an amenable number.

61746613661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61746613661 is an equidigital number, since it uses as much as digits as its factorization.

61746613661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The spelling of 61746613661 in words is "sixty-one billion, seven hundred forty-six million, six hundred thirteen thousand, six hundred sixty-one".