12178178385 has 16 divisors (see below), whose sum is σ = 19704021120. Its totient is φ = 6422049920.

The previous prime is 12178178359. The next prime is 12178178387. The reversal of 12178178385 is 58387187121.

It is a happy number.

It is not a de Polignac number, because 12178178385 - 2⁶ = 12178178321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12178178387) 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, 4559781 + ... + 4562450.

It is an arithmetic number, because the mean of its divisors is an integer number (1231501320).

Almost surely, 2^12178178385 is an apocalyptic number.

12178178385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12178178385 is a deficient number, since it is larger than the sum of its proper divisors (7525842735).

12178178385 is an equidigital number, since it uses as much as digits as its factorization.

12178178385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9122328.

The product of its digits is 752640, while the sum is 51.

The spelling of 12178178385 in words is "twelve billion, one hundred seventy-eight million, one hundred seventy-eight thousand, three hundred eighty-five".