12505720909 has 8 divisors (see below), whose sum is σ = 14011324128. Its totient is φ = 11061570960.

The previous prime is 12505720907. The next prime is 12505720921. The reversal of 12505720909 is 90902750521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12505720909 - 2¹ = 12505720907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505720901) 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, 15362887 + ... + 15363700.

It is an arithmetic number, because the mean of its divisors is an integer number (1751415516).

Almost surely, 2^12505720909 is an apocalyptic number.

It is an amenable number.

12505720909 is a deficient number, since it is larger than the sum of its proper divisors (1505603219).

12505720909 is a wasteful number, since it uses less digits than its factorization.

12505720909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30726635.

The product of its (nonzero) digits is 56700, while the sum is 40.

The spelling of 12505720909 in words is "twelve billion, five hundred five million, seven hundred twenty thousand, nine hundred nine".