12279638898 has 18 divisors (see below), whose sum is σ = 26606902959. Its totient is φ = 4093056252.

The previous prime is 12279638879. The next prime is 12279638909. The reversal of 12279638898 is 89883697221.

It can be written as a sum of positive squares in only one way, i.e., 6139819449 + 6139819449 = 78357^2 + 78357^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=78357.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 457083 + ... + 483201.

Almost surely, 2^12279638898 is an apocalyptic number.

12279638898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12279638898 is an abundant number, since it is smaller than the sum of its proper divisors (14327264061).

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

12279638898 is an frugal number, since it uses more digits than its factorization.

12279638898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52246 (or 26124 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 12279638898 in words is "twelve billion, two hundred seventy-nine million, six hundred thirty-eight thousand, eight hundred ninety-eight".