2778338387913 has 32 divisors (see below), whose sum is σ = 4180901477760. Its totient is φ = 1625649768960.

The previous prime is 2778338387849. The next prime is 2778338387917. The reversal of 2778338387913 is 3197838338772.

It is not a de Polignac number, because 2778338387913 - 2⁶ = 2778338387849 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2778338387917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12789781 + ... + 13005197.

It is an arithmetic number, because the mean of its divisors is an integer number (130653171180).

Almost surely, 2^{2778338387913} is an apocalyptic number.

It is an amenable number.

2778338387913 is a deficient number, since it is larger than the sum of its proper divisors (1402563089847).

2778338387913 is a wasteful number, since it uses less digits than its factorization.

2778338387913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228937.

The product of its digits is 256048128, while the sum is 69.

The spelling of 2778338387913 in words is "two trillion, seven hundred seventy-eight billion, three hundred thirty-eight million, three hundred eighty-seven thousand, nine hundred thirteen".