12138562305 has 12 divisors (see below), whose sum is σ = 21040174740. Its totient is φ = 6473899872.

The previous prime is 12138562291. The next prime is 12138562367. The reversal of 12138562305 is 50326583121.

12138562305 is a `hidden beast` number, since 1 + 21 + 3 + 8 + 5 + 623 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5068443249 + 7070119056 = 71193^2 + 84084^2 .

It is not a de Polignac number, because 12138562305 - 2⁹ = 12138561793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12138562305.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134872870 + ... + 134872959.

It is an arithmetic number, because the mean of its divisors is an integer number (1753347895).

Almost surely, 2^12138562305 is an apocalyptic number.

12138562305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12138562305 is a deficient number, since it is larger than the sum of its proper divisors (8901612435).

12138562305 is a wasteful number, since it uses less digits than its factorization.

12138562305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269745840 (or 269745837 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 12138562305 in words is "twelve billion, one hundred thirty-eight million, five hundred sixty-two thousand, three hundred five".