13347777777778 has 4 divisors (see below), whose sum is σ = 20021666666670. Its totient is φ = 6673888888888.

The previous prime is 13347777777769. The next prime is 13347777777811. The reversal of 13347777777778 is 87777777774331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10744385846769 + 2603391931009 = 3277863^2 + 1613503^2 .

It is a plaindrome in base 10.

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 as a sum of consecutive naturals, namely, 3336944444443 + ... + 3336944444446.

Almost surely, 2^{13347777777778} is an apocalyptic number.

13347777777778 is a deficient number, since it is larger than the sum of its proper divisors (6673888888892).

13347777777778 is an equidigital number, since it uses as much as digits as its factorization.

13347777777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673888888891.

The product of its digits is 11621838816, while the sum is 82.

The spelling of 13347777777778 in words is "thirteen trillion, three hundred forty-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".