12915805840 has 80 divisors (see below), whose sum is σ = 34337802240. Its totient is φ = 4425868800.

The previous prime is 12915805829. The next prime is 12915805841. The reversal of 12915805840 is 4850851921.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (12915805841) 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, 1248690 + ... + 1258990.

It is an arithmetic number, because the mean of its divisors is an integer number (429222528).

Almost surely, 2^12915805840 is an apocalyptic number.

12915805840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12915805840 is an abundant number, since it is smaller than the sum of its proper divisors (21421996400).

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

12915805840 is a wasteful number, since it uses less digits than its factorization.

12915805840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560 (or 12554 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 12915805840 in words is "twelve billion, nine hundred fifteen million, eight hundred five thousand, eight hundred forty".