6601261521149 has 2 divisors, whose sum is σ = 6601261521150. Its totient is φ = 6601261521148.

The previous prime is 6601261521089. The next prime is 6601261521161. The reversal of 6601261521149 is 9411251621066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4719508588249 + 1881752932900 = 2172443^2 + 1371770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6601261521149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601261526149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300630760574 + 3300630760575.

It is an arithmetic number, because the mean of its divisors is an integer number (3300630760575).

Almost surely, 2^{6601261521149} is an apocalyptic number.

It is an amenable number.

6601261521149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601261521149 is an equidigital number, since it uses as much as digits as its factorization.

6601261521149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 6601261521149 in words is "six trillion, six hundred one billion, two hundred sixty-one million, five hundred twenty-one thousand, one hundred forty-nine".