12391912255085 has 64 divisors (see below), whose sum is σ = 17803660861440. Its totient is φ = 8177785144320.

The previous prime is 12391912255081. The next prime is 12391912255103. The reversal of 12391912255085 is 58055221919321.

It is not a de Polignac number, because 12391912255085 - 2² = 12391912255081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391912255081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 839936 + ... + 5048694.

It is an arithmetic number, because the mean of its divisors is an integer number (278182200960).

Almost surely, 2^{12391912255085} is an apocalyptic number.

It is an amenable number.

12391912255085 is a deficient number, since it is larger than the sum of its proper divisors (5411748606355).

12391912255085 is a wasteful number, since it uses less digits than its factorization.

12391912255085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208906.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 12391912255085 in words is "twelve trillion, three hundred ninety-one billion, nine hundred twelve million, two hundred fifty-five thousand, eighty-five".