9661659439001 has 2 divisors, whose sum is σ = 9661659439002. Its totient is φ = 9661659439000.

The previous prime is 9661659438929. The next prime is 9661659439057. The reversal of 9661659439001 is 1009349561669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7117797126400 + 2543862312601 = 2667920^2 + 1594949^2 .

It is an emirp because it is prime and its reverse (1009349561669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9661659439001 - 2³⁴ = 9644479569817 is a prime.

It is not a weakly prime, because it can be changed into another prime (9661655439001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830829719500 + 4830829719501.

It is an arithmetic number, because the mean of its divisors is an integer number (4830829719501).

Almost surely, 2^{9661659439001} is an apocalyptic number.

It is an amenable number.

9661659439001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661659439001 is an equidigital number, since it uses as much as digits as its factorization.

9661659439001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9447840, while the sum is 59.

The spelling of 9661659439001 in words is "nine trillion, six hundred sixty-one billion, six hundred fifty-nine million, four hundred thirty-nine thousand, one".