13778874321877 has 12 divisors (see below), whose sum is σ = 16193728590060. Its totient is φ = 11688706342656.

The previous prime is 13778874321857. The next prime is 13778874321881. The reversal of 13778874321877 is 77812347887731.

It can be written as a sum of positive squares in 2 ways, for example, as 10632334047076 + 3146540274801 = 3260726^2 + 1773849^2 .

It is not a de Polignac number, because 13778874321877 - 2³¹ = 13776726838229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13778874321857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1449487602 + ... + 1449497107.

It is an arithmetic number, because the mean of its divisors is an integer number (1349477382505).

Almost surely, 2^{13778874321877} is an apocalyptic number.

It is an amenable number.

13778874321877 is a deficient number, since it is larger than the sum of its proper divisors (2414854268183).

13778874321877 is an equidigital number, since it uses as much as digits as its factorization.

13778874321877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898984820 (or 2898984813 counting only the distinct ones).

The product of its digits is 619573248, while the sum is 73.

The spelling of 13778874321877 in words is "thirteen trillion, seven hundred seventy-eight billion, eight hundred seventy-four million, three hundred twenty-one thousand, eight hundred seventy-seven".