12585778458 has 48 divisors (see below), whose sum is σ = 27844390560. Its totient is φ = 3789545760.

The previous prime is 12585778441. The next prime is 12585778483. The reversal of 12585778458 is 85487758521.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58773 + ... + 169191.

It is an arithmetic number, because the mean of its divisors is an integer number (580091470).

Almost surely, 2^12585778458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12585778458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13922195280).

12585778458 is an abundant number, since it is smaller than the sum of its proper divisors (15258612102).

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

12585778458 is a wasteful number, since it uses less digits than its factorization.

12585778458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110603 (or 110592 counting only the distinct ones).

The product of its digits is 25088000, while the sum is 60.

The spelling of 12585778458 in words is "twelve billion, five hundred eighty-five million, seven hundred seventy-eight thousand, four hundred fifty-eight".