12505878615 has 8 divisors (see below), whose sum is σ = 20009405808. Its totient is φ = 6669801920.

The previous prime is 12505878611. The next prime is 12505878617. The reversal of 12505878615 is 51687850521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12505878615 - 2² = 12505878611 is a prime.

It is a super-2 number, since 2×12505878615² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505878611) 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, 416862606 + ... + 416862635.

It is an arithmetic number, because the mean of its divisors is an integer number (2501175726).

Almost surely, 2^12505878615 is an apocalyptic number.

12505878615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12505878615 is a deficient number, since it is larger than the sum of its proper divisors (7503527193).

12505878615 is an equidigital number, since it uses as much as digits as its factorization.

12505878615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833725249.

The product of its (nonzero) digits is 672000, while the sum is 48.

The spelling of 12505878615 in words is "twelve billion, five hundred five million, eight hundred seventy-eight thousand, six hundred fifteen".