12538527784 has 8 divisors (see below), whose sum is σ = 23509739610. Its totient is φ = 6269263888.

The previous prime is 12538527779. The next prime is 12538527811. The reversal of 12538527784 is 48772583521.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10964184100 + 1574343684 = 104710^2 + 39678^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783657979 + ... + 783657994.

Almost surely, 2^12538527784 is an apocalyptic number.

It is an amenable number.

12538527784 is a deficient number, since it is larger than the sum of its proper divisors (10971211826).

12538527784 is a wasteful number, since it uses less digits than its factorization.

12538527784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567315979 (or 1567315975 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 52.

The spelling of 12538527784 in words is "twelve billion, five hundred thirty-eight million, five hundred twenty-seven thousand, seven hundred eighty-four".