11817471747 has 4 divisors (see below), whose sum is σ = 15756629000. Its totient is φ = 7878314496.

The previous prime is 11817471733. The next prime is 11817471751. The reversal of 11817471747 is 74717471811.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-11817471747 is a prime.

It is a super-2 number, since 2×11817471747² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11817471696 and 11817471705.

It is not an unprimeable number, because it can be changed into a prime (11817470747) 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, 1969578622 + ... + 1969578627.

It is an arithmetic number, because the mean of its divisors is an integer number (3939157250).

Almost surely, 2^11817471747 is an apocalyptic number.

11817471747 is a deficient number, since it is larger than the sum of its proper divisors (3939157253).

11817471747 is an equidigital number, since it uses as much as digits as its factorization.

11817471747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939157252.

The product of its digits is 307328, while the sum is 48.

The spelling of 11817471747 in words is "eleven billion, eight hundred seventeen million, four hundred seventy-one thousand, seven hundred forty-seven".