338613985781 has 4 divisors (see below), whose sum is σ = 338615666700. Its totient is φ = 338612304864.

The previous prime is 338613985771. The next prime is 338613985789. The reversal of 338613985781 is 187589316833.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187589316833 = 83 ⋅2260112251.

It can be written as a sum of positive squares in 2 ways, for example, as 206820300625 + 131793685156 = 454775^2 + 363034^2 .

It is a cyclic number.

It is not a de Polignac number, because 338613985781 - 2²² = 338609791477 is a prime.

It is a super-2 number, since 2×338613985781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338613985789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489416 + ... + 957473.

It is an arithmetic number, because the mean of its divisors is an integer number (84653916675).

Almost surely, 2^338613985781 is an apocalyptic number.

It is an amenable number.

338613985781 is a deficient number, since it is larger than the sum of its proper divisors (1680919).

338613985781 is a wasteful number, since it uses less digits than its factorization.

338613985781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680918.

The product of its digits is 26127360, while the sum is 62.

The spelling of 338613985781 in words is "three hundred thirty-eight billion, six hundred thirteen million, nine hundred eighty-five thousand, seven hundred eighty-one".