1338470177981 has 2 divisors, whose sum is σ = 1338470177982. Its totient is φ = 1338470177980.

The previous prime is 1338470177951. The next prime is 1338470177983. The reversal of 1338470177981 is 1897710748331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029879928900 + 308590249081 = 1014830^2 + 555509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338470177981 - 2⁶ = 1338470177917 is a prime.

It is a super-2 number, since 2×1338470177981² (a number of 25 digits) contains 22 as substring.

Together with 1338470177983, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1338470177981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338470177983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669235088990 + 669235088991.

It is an arithmetic number, because the mean of its divisors is an integer number (669235088991).

Almost surely, 2^{1338470177981} is an apocalyptic number.

It is an amenable number.

1338470177981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338470177981 is an equidigital number, since it uses as much as digits as its factorization.

1338470177981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7112448, while the sum is 59.

The spelling of 1338470177981 in words is "one trillion, three hundred thirty-eight billion, four hundred seventy million, one hundred seventy-seven thousand, nine hundred eighty-one".