12506736656 has 10 divisors (see below), whose sum is σ = 24231802302. Its totient is φ = 6253368320.

The previous prime is 12506736629. The next prime is 12506736667. The reversal of 12506736656 is 65663760521.

It can be written as a sum of positive squares in only one way, i.e., 10407264256 + 2099472400 = 102016^2 + 45820^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12506736656.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390835505 + ... + 390835536.

Almost surely, 2^12506736656 is an apocalyptic number.

12506736656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12506736656 is a deficient number, since it is larger than the sum of its proper divisors (11725065646).

12506736656 is an equidigital number, since it uses as much as digits as its factorization.

12506736656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781671049 (or 781671043 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 12506736656 in words is "twelve billion, five hundred six million, seven hundred thirty-six thousand, six hundred fifty-six".