12523285638 has 16 divisors (see below), whose sum is σ = 27829523760. Its totient is φ = 4174428528.

The previous prime is 12523285633. The next prime is 12523285657. The reversal of 12523285638 is 83658232521.

12523285638 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 3 + 2 + 8 + 5 + 638 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12523285593 and 12523285602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12523285633) 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, 115956295 + ... + 115956402.

It is an arithmetic number, because the mean of its divisors is an integer number (1739345235).

Almost surely, 2^12523285638 is an apocalyptic number.

12523285638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12523285638 is an abundant number, since it is smaller than the sum of its proper divisors (15306238122).

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

12523285638 is a wasteful number, since it uses less digits than its factorization.

12523285638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231912708 (or 231912702 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 12523285638 in words is "twelve billion, five hundred twenty-three million, two hundred eighty-five thousand, six hundred thirty-eight".