1338337778278 has 4 divisors (see below), whose sum is σ = 2007506667420. Its totient is φ = 669168889138.

The previous prime is 1338337778249. The next prime is 1338337778293. The reversal of 1338337778278 is 8728777338331.

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

It is a super-2 number, since 2×1338337778278² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334584444568 + ... + 334584444571.

It is an arithmetic number, because the mean of its divisors is an integer number (501876666855).

Almost surely, 2^{1338337778278} is an apocalyptic number.

1338337778278 is a deficient number, since it is larger than the sum of its proper divisors (669168889142).

1338337778278 is an equidigital number, since it uses as much as digits as its factorization.

1338337778278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669168889141.

The product of its digits is 199148544, while the sum is 67.

The spelling of 1338337778278 in words is "one trillion, three hundred thirty-eight billion, three hundred thirty-seven million, seven hundred seventy-eight thousand, two hundred seventy-eight".