12978354615 has 8 divisors (see below), whose sum is σ = 20765367408. Its totient is φ = 6921789120.

The previous prime is 12978354611. The next prime is 12978354619. The reversal of 12978354615 is 51645387921.

It is an interprime number because it is at equal distance from previous prime (12978354611) and next prime (12978354619).

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

It is not a de Polignac number, because 12978354615 - 2² = 12978354611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978354611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432611806 + ... + 432611835.

It is an arithmetic number, because the mean of its divisors is an integer number (2595670926).

Almost surely, 2^12978354615 is an apocalyptic number.

12978354615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12978354615 is a deficient number, since it is larger than the sum of its proper divisors (7787012793).

12978354615 is an equidigital number, since it uses as much as digits as its factorization.

12978354615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865223649.

The product of its digits is 1814400, while the sum is 51.

The spelling of 12978354615 in words is "twelve billion, nine hundred seventy-eight million, three hundred fifty-four thousand, six hundred fifteen".