11661762417649 has 2 divisors, whose sum is σ = 11661762417650. Its totient is φ = 11661762417648.

The previous prime is 11661762417619. The next prime is 11661762417653. The reversal of 11661762417649 is 94671426716611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11188924650225 + 472837767424 = 3344985^2 + 687632^2 .

It is a cyclic number.

It is not a de Polignac number, because 11661762417649 - 2¹³ = 11661762409457 is a prime.

It is not a weakly prime, because it can be changed into another prime (11661762417619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830881208824 + 5830881208825.

It is an arithmetic number, because the mean of its divisors is an integer number (5830881208825).

Almost surely, 2^{11661762417649} is an apocalyptic number.

It is an amenable number.

11661762417649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661762417649 is an equidigital number, since it uses as much as digits as its factorization.

11661762417649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 61.

The spelling of 11661762417649 in words is "eleven trillion, six hundred sixty-one billion, seven hundred sixty-two million, four hundred seventeen thousand, six hundred forty-nine".