11810681329 has 4 divisors (see below), whose sum is σ = 11822137920. Its totient is φ = 11799224740.

The previous prime is 11810681321. The next prime is 11810681341. The reversal of 11810681329 is 92318601811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92318601811 = 97 ⋅951738163.

It is a cyclic number.

It is not a de Polignac number, because 11810681329 - 2³ = 11810681321 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11810681291 and 11810681300.

It is not an unprimeable number, because it can be changed into a prime (11810681321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5726749 + ... + 5728810.

It is an arithmetic number, because the mean of its divisors is an integer number (2955534480).

Almost surely, 2^11810681329 is an apocalyptic number.

It is an amenable number.

11810681329 is a deficient number, since it is larger than the sum of its proper divisors (11456591).

11810681329 is a wasteful number, since it uses less digits than its factorization.

11810681329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11456590.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 11810681329 in words is "eleven billion, eight hundred ten million, six hundred eighty-one thousand, three hundred twenty-nine".