12499999999 has 2 divisors, whose sum is σ = 12500000000. Its totient is φ = 12499999998.

The previous prime is 12499999951. The next prime is 12500000027. The reversal of 12499999999 is 99999999421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12499999999 - 2⁹ = 12499999487 is a prime.

12499999999 is a modest number, since divided by 999999 gives 12499 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12499999909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249999999 + 6250000000.

It is an arithmetic number, because the mean of its divisors is an integer number (6250000000).

Almost surely, 2^12499999999 is an apocalyptic number.

12499999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

12499999999 is an equidigital number, since it uses as much as digits as its factorization.

12499999999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344373768, while the sum is 79.

It can be divided in two parts, 1 and 2499999999, that added together give a square (2500000000 = 50000²).

The spelling of 12499999999 in words is "twelve billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".