11538681757 has 2 divisors, whose sum is σ = 11538681758. Its totient is φ = 11538681756.

The previous prime is 11538681689. The next prime is 11538681767. The reversal of 11538681757 is 75718683511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10353876516 + 1184805241 = 101754^2 + 34421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11538681757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11538681767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5769340878 + 5769340879.

It is an arithmetic number, because the mean of its divisors is an integer number (5769340879).

Almost surely, 2^11538681757 is an apocalyptic number.

It is an amenable number.

11538681757 is a deficient number, since it is larger than the sum of its proper divisors (1).

11538681757 is an equidigital number, since it uses as much as digits as its factorization.

11538681757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 52.

It can be divided in two parts, 1153868 and 1757, that added together give a square (1155625 = 1075²).

The spelling of 11538681757 in words is "eleven billion, five hundred thirty-eight million, six hundred eighty-one thousand, seven hundred fifty-seven".