12265407640 has 64 divisors (see below), whose sum is σ = 28209202560. Its totient is φ = 4797542400.

The previous prime is 12265407617. The next prime is 12265407643. The reversal of 12265407640 is 4670456221.

It is a self number, because there is not a number n which added to its sum of digits gives 12265407640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12265407643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2917540 + ... + 2921740.

It is an arithmetic number, because the mean of its divisors is an integer number (440768790).

Almost surely, 2^12265407640 is an apocalyptic number.

12265407640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12265407640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14104601280).

12265407640 is an abundant number, since it is smaller than the sum of its proper divisors (15943794920).

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

12265407640 is a wasteful number, since it uses less digits than its factorization.

12265407640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812 (or 5808 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 12265407640 in words is "twelve billion, two hundred sixty-five million, four hundred seven thousand, six hundred forty".