11998609818 has 16 divisors (see below), whose sum is σ = 25843159776. Its totient is φ = 3691879920.

The previous prime is 11998609813. The next prime is 11998609841. The reversal of 11998609818 is 81890689911.

It is not an unprimeable number, because it can be changed into a prime (11998609813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76914088 + ... + 76914243.

It is an arithmetic number, because the mean of its divisors is an integer number (1615197486).

Almost surely, 2^11998609818 is an apocalyptic number.

11998609818 is an abundant number, since it is smaller than the sum of its proper divisors (13844549958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11998609818 is a wasteful number, since it uses less digits than its factorization.

11998609818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153828349.

The product of its (nonzero) digits is 2239488, while the sum is 60.

The spelling of 11998609818 in words is "eleven billion, nine hundred ninety-eight million, six hundred nine thousand, eight hundred eighteen".