11811326499 has 16 divisors (see below), whose sum is σ = 19998013440. Its totient is φ = 6749329320.

The previous prime is 11811326491. The next prime is 11811326531. The reversal of 11811326499 is 99462311811.

11811326499 is a `hidden beast` number, since 118 + 11 + 32 + 6 + 499 = 666.

It is not a de Polignac number, because 11811326499 - 2³ = 11811326491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11811326491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31246707 + ... + 31247084.

It is an arithmetic number, because the mean of its divisors is an integer number (1249875840).

Almost surely, 2^11811326499 is an apocalyptic number.

11811326499 is a deficient number, since it is larger than the sum of its proper divisors (8186686941).

11811326499 is an equidigital number, since it uses as much as digits as its factorization.

11811326499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62493807 (or 62493801 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The spelling of 11811326499 in words is "eleven billion, eight hundred eleven million, three hundred twenty-six thousand, four hundred ninety-nine".