12978222085 has 8 divisors (see below), whose sum is σ = 15574484376. Its totient is φ = 10382165760.

The previous prime is 12978222077. The next prime is 12978222097. The reversal of 12978222085 is 58022287921.

It is a Cunningham number, because it is equal to 113922²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 12978222084 = 1^2 + 113922^2 .

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

It is not a de Polignac number, because 12978222085 - 2³ = 12978222077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190737 + ... + 249673.

It is an arithmetic number, because the mean of its divisors is an integer number (1946810547).

Almost surely, 2^12978222085 is an apocalyptic number.

It is an amenable number.

12978222085 is a deficient number, since it is larger than the sum of its proper divisors (2596262291).

12978222085 is an equidigital number, since it uses as much as digits as its factorization.

12978222085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102983.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 12978222085 in words is "twelve billion, nine hundred seventy-eight million, two hundred twenty-two thousand, eighty-five".