11642558549 has 2 divisors, whose sum is σ = 11642558550. Its totient is φ = 11642558548.

The previous prime is 11642558537. The next prime is 11642558591. The reversal of 11642558549 is 94585524611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9963034225 + 1679524324 = 99815^2 + 40982^2 .

It is an emirp because it is prime and its reverse (94585524611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11642558549 - 2⁸ = 11642558293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11642558497 and 11642558506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11642554549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821279274 + 5821279275.

It is an arithmetic number, because the mean of its divisors is an integer number (5821279275).

Almost surely, 2^11642558549 is an apocalyptic number.

It is an amenable number.

11642558549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11642558549 is an equidigital number, since it uses as much as digits as its factorization.

11642558549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728000, while the sum is 50.

The spelling of 11642558549 in words is "eleven billion, six hundred forty-two million, five hundred fifty-eight thousand, five hundred forty-nine".