11138542385 has 4 divisors (see below), whose sum is σ = 13366250868. Its totient is φ = 8910833904.

The previous prime is 11138542357. The next prime is 11138542403. The reversal of 11138542385 is 58324583111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58324583111 = 106751 ⋅546361.

It can be written as a sum of positive squares in 2 ways, for example, as 2232468001 + 8906074384 = 47249^2 + 94372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11138542385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113854234 + ... + 1113854243.

It is an arithmetic number, because the mean of its divisors is an integer number (3341562717).

Almost surely, 2^11138542385 is an apocalyptic number.

It is an amenable number.

11138542385 is a deficient number, since it is larger than the sum of its proper divisors (2227708483).

11138542385 is an equidigital number, since it uses as much as digits as its factorization.

11138542385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227708482.

The product of its digits is 115200, while the sum is 41.

The spelling of 11138542385 in words is "eleven billion, one hundred thirty-eight million, five hundred forty-two thousand, three hundred eighty-five".