12378278653 has 8 divisors (see below), whose sum is σ = 13513063928. Its totient is φ = 11269580544.

The previous prime is 12378278651. The next prime is 12378278677. The reversal of 12378278653 is 35687287321.

It can be written as a sum of positive squares in 4 ways, for example, as 2737591684 + 9640686969 = 52322^2 + 98187^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12378278653 - 2¹ = 12378278651 is a prime.

It is a super-2 number, since 2×12378278653² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12378278653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12378278651) 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, 6520800 + ... + 6522697.

It is an arithmetic number, because the mean of its divisors is an integer number (1689132991).

Almost surely, 2^12378278653 is an apocalyptic number.

12378278653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12378278653 is a deficient number, since it is larger than the sum of its proper divisors (1134785275).

12378278653 is a wasteful number, since it uses less digits than its factorization.

12378278653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13043583.

The product of its digits is 3386880, while the sum is 52.

The spelling of 12378278653 in words is "twelve billion, three hundred seventy-eight million, two hundred seventy-eight thousand, six hundred fifty-three".