12247025778 has 24 divisors (see below), whose sum is σ = 28576394028. Its totient is φ = 3768315552.

The previous prime is 12247025753. The next prime is 12247025783. The reversal of 12247025778 is 87752074221.

12247025778 is a `hidden beast` number, since 1 + 2 + 2 + 4 + 70 + 2 + 577 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11956766409 + 290259369 = 109347^2 + 17037^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26168625 + ... + 26169092.

Almost surely, 2^12247025778 is an apocalyptic number.

12247025778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12247025778 is an abundant number, since it is smaller than the sum of its proper divisors (16329368250).

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

12247025778 is a wasteful number, since it uses less digits than its factorization.

12247025778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52337738 (or 52337735 counting only the distinct ones).

The product of its (nonzero) digits is 439040, while the sum is 45.

Adding to 12247025778 its reverse (87752074221), we get a palindrome (99999099999).

The spelling of 12247025778 in words is "twelve billion, two hundred forty-seven million, twenty-five thousand, seven hundred seventy-eight".