12685078505658 has 64 divisors (see below), whose sum is σ = 27384911769600. Its totient is φ = 3894074509248.

The previous prime is 12685078505653. The next prime is 12685078505731. The reversal of 12685078505658 is 85650587058621.

12685078505658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12685078505658² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12685078505651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274551643 + ... + 274597841.

It is an arithmetic number, because the mean of its divisors is an integer number (427889246400).

Almost surely, 2^{12685078505658} is an apocalyptic number.

12685078505658 is an abundant number, since it is smaller than the sum of its proper divisors (14699833263942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12685078505658 is a wasteful number, since it uses less digits than its factorization.

12685078505658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54283.

The product of its (nonzero) digits is 161280000, while the sum is 66.

The spelling of 12685078505658 in words is "twelve trillion, six hundred eighty-five billion, seventy-eight million, five hundred five thousand, six hundred fifty-eight".