3818781629393 has 4 divisors (see below), whose sum is σ = 3867120637440. Its totient is φ = 3770442621348.

The previous prime is 3818781629387. The next prime is 3818781629459. The reversal of 3818781629393 is 3939261878183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3818781629393 - 2⁶ = 3818781629329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3818781629303) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 24169503905 + ... + 24169504062.

It is an arithmetic number, because the mean of its divisors is an integer number (966780159360).

Almost surely, 2^{3818781629393} is an apocalyptic number.

It is an amenable number.

3818781629393 is a deficient number, since it is larger than the sum of its proper divisors (48339008047).

3818781629393 is an equidigital number, since it uses as much as digits as its factorization.

3818781629393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48339008046.

The product of its digits is 94058496, while the sum is 68.

The spelling of 3818781629393 in words is "three trillion, eight hundred eighteen billion, seven hundred eighty-one million, six hundred twenty-nine thousand, three hundred ninety-three".