12521783925 has 144 divisors (see below), whose sum is σ = 28146448512. Its totient is φ = 5387212800.

The previous prime is 12521783917. The next prime is 12521783927. The reversal of 12521783925 is 52938712521.

12521783925 is a `hidden beast` number, since 1 + 2 + 521 + 78 + 39 + 25 = 666.

It is not a de Polignac number, because 12521783925 - 2³ = 12521783917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521783927) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 714265 + ... + 731585.

It is an arithmetic number, because the mean of its divisors is an integer number (195461448).

Almost surely, 2^12521783925 is an apocalyptic number.

12521783925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12521783925 is an abundant number, since it is smaller than the sum of its proper divisors (15624664587).

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

12521783925 is a wasteful number, since it uses less digits than its factorization.

12521783925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17370 (or 17353 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 12521783925 in words is "twelve billion, five hundred twenty-one million, seven hundred eighty-three thousand, nine hundred twenty-five".