12778617745 has 8 divisors (see below), whose sum is σ = 15528447360. Its totient is φ = 10093490160.

The previous prime is 12778617737. The next prime is 12778617767. The reversal of 12778617745 is 54771687721.

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

It is not a de Polignac number, because 12778617745 - 2³ = 12778617737 is a prime.

It is an unprimeable number.

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, 16175071 + ... + 16175860.

It is an arithmetic number, because the mean of its divisors is an integer number (1941055920).

Almost surely, 2^12778617745 is an apocalyptic number.

It is an amenable number.

12778617745 is a deficient number, since it is larger than the sum of its proper divisors (2749829615).

12778617745 is an equidigital number, since it uses as much as digits as its factorization.

12778617745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32351015.

The product of its digits is 4609920, while the sum is 55.

It can be divided in two parts, 1277861 and 7745, that added together give a triangular number (1285606 = T₁₆₀₃).

The spelling of 12778617745 in words is "twelve billion, seven hundred seventy-eight million, six hundred seventeen thousand, seven hundred forty-five".