12778788845545 has 16 divisors (see below), whose sum is σ = 15380163007488. Its totient is φ = 10192634038080.

The previous prime is 12778788845509. The next prime is 12778788845567. The reversal of 12778788845545 is 54554888787721.

It is not a de Polignac number, because 12778788845545 - 2²¹ = 12778786748393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6512592 + ... + 8244478.

It is an arithmetic number, because the mean of its divisors is an integer number (961260187968).

Almost surely, 2^{12778788845545} is an apocalyptic number.

It is an amenable number.

12778788845545 is a deficient number, since it is larger than the sum of its proper divisors (2601374161943).

12778788845545 is a wasteful number, since it uses less digits than its factorization.

12778788845545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736280.

The product of its digits is 5619712000, while the sum is 79.

The spelling of 12778788845545 in words is "twelve trillion, seven hundred seventy-eight billion, seven hundred eighty-eight million, eight hundred forty-five thousand, five hundred forty-five".