12525279840 has 72 divisors (see below), whose sum is σ = 42742522368. Its totient is φ = 3340074240.

The previous prime is 12525279817. The next prime is 12525279841. The reversal of 12525279840 is 4897252521.

12525279840 is a `hidden beast` number, since 12 + 525 + 2 + 79 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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 (12525279841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4347616 + ... + 4350495.

It is an arithmetic number, because the mean of its divisors is an integer number (593646144).

Almost surely, 2^12525279840 is an apocalyptic number.

12525279840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12525279840 is an abundant number, since it is smaller than the sum of its proper divisors (30217242528).

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

12525279840 is a wasteful number, since it uses less digits than its factorization.

12525279840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698132 (or 8698121 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 12525279840 in words is "twelve billion, five hundred twenty-five million, two hundred seventy-nine thousand, eight hundred forty".