12409147818 has 24 divisors (see below), whose sum is σ = 28055465568. Its totient is φ = 3956539752.

The previous prime is 12409147813. The next prime is 12409147831. The reversal of 12409147818 is 81874190421.

It is a super-2 number, since 2×12409147818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12409147811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14986480 + ... + 14987307.

It is an arithmetic number, because the mean of its divisors is an integer number (1168977732).

Almost surely, 2^12409147818 is an apocalyptic number.

12409147818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12409147818 is an abundant number, since it is smaller than the sum of its proper divisors (15646317750).

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

12409147818 is a wasteful number, since it uses less digits than its factorization.

12409147818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29973818 (or 29973815 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 12409147818 in words is "twelve billion, four hundred nine million, one hundred forty-seven thousand, eight hundred eighteen".