1818378941403 has 16 divisors (see below), whose sum is σ = 2427472156320. Its totient is φ = 1210769624064.

The previous prime is 1818378941389. The next prime is 1818378941419. The reversal of 1818378941403 is 3041498738181.

It is not a de Polignac number, because 1818378941403 - 2¹² = 1818378937307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1818378941453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17310343 + ... + 17415071.

It is an arithmetic number, because the mean of its divisors is an integer number (151717009770).

Almost surely, 2^{1818378941403} is an apocalyptic number.

1818378941403 is a deficient number, since it is larger than the sum of its proper divisors (609093214917).

1818378941403 is a wasteful number, since it uses less digits than its factorization.

1818378941403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111758.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 1818378941403 in words is "one trillion, eight hundred eighteen billion, three hundred seventy-eight million, nine hundred forty-one thousand, four hundred three".