12500000001 has 8 divisors (see below), whose sum is σ = 18518518560. Its totient is φ = 8333333316.

The previous prime is 12499999999. The next prime is 12500000027. The reversal of 12500000001 is 10000000521.

It is a happy number.

It is not a de Polignac number, because 12500000001 - 2¹ = 12499999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12500000081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231481455 + ... + 231481508.

It is an arithmetic number, because the mean of its divisors is an integer number (2314814820).

Almost surely, 2^12500000001 is an apocalyptic number.

It is an amenable number.

12500000001 is a deficient number, since it is larger than the sum of its proper divisors (6018518559).

12500000001 is an equidigital number, since it uses as much as digits as its factorization.

12500000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462962972 (or 462962966 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

Adding to 12500000001 its reverse (10000000521), we get a palindrome (22500000522).

The spelling of 12500000001 in words is "twelve billion, five hundred million, one", and thus it is an aban number.