9966860361749 has 2 divisors, whose sum is σ = 9966860361750. Its totient is φ = 9966860361748.

The previous prime is 9966860361737. The next prime is 9966860361781. The reversal of 9966860361749 is 9471630686699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8929446815524 + 1037413546225 = 2988218^2 + 1018535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9966860361749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966860361719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983430180874 + 4983430180875.

It is an arithmetic number, because the mean of its divisors is an integer number (4983430180875).

Almost surely, 2^{9966860361749} is an apocalyptic number.

It is an amenable number.

9966860361749 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966860361749 is an equidigital number, since it uses as much as digits as its factorization.

9966860361749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 634894848, while the sum is 74.

The spelling of 9966860361749 in words is "nine trillion, nine hundred sixty-six billion, eight hundred sixty million, three hundred sixty-one thousand, seven hundred forty-nine".