12009129895 has 16 divisors (see below), whose sum is σ = 16472151360. Its totient is φ = 8233588224.

The previous prime is 12009129893. The next prime is 12009129901. The reversal of 12009129895 is 59892190021.

It is a cyclic number.

It is not a de Polignac number, because 12009129895 - 2¹ = 12009129893 is a prime.

It is a super-2 number, since 2×12009129895² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12009129893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250741 + ... + 294769.

It is an arithmetic number, because the mean of its divisors is an integer number (1029509460).

Almost surely, 2^12009129895 is an apocalyptic number.

12009129895 is a deficient number, since it is larger than the sum of its proper divisors (4463021465).

12009129895 is an equidigital number, since it uses as much as digits as its factorization.

12009129895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51834.

The product of its (nonzero) digits is 116640, while the sum is 46.

The spelling of 12009129895 in words is "twelve billion, nine million, one hundred twenty-nine thousand, eight hundred ninety-five".