11540639948549 has 2 divisors, whose sum is σ = 11540639948550. Its totient is φ = 11540639948548.

The previous prime is 11540639948543. The next prime is 11540639948557. The reversal of 11540639948549 is 94584993604511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10385859744100 + 1154780204449 = 3222710^2 + 1074607^2 .

It is an emirp because it is prime and its reverse (94584993604511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11540639948549 - 2²⁸ = 11540371513093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11540639948543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5770319974274 + 5770319974275.

It is an arithmetic number, because the mean of its divisors is an integer number (5770319974275).

Almost surely, 2^{11540639948549} is an apocalyptic number.

It is an amenable number.

11540639948549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11540639948549 is an equidigital number, since it uses as much as digits as its factorization.

11540639948549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 167961600, while the sum is 68.

The spelling of 11540639948549 in words is "eleven trillion, five hundred forty billion, six hundred thirty-nine million, nine hundred forty-eight thousand, five hundred forty-nine".