1918226888663 has 4 divisors (see below), whose sum is σ = 1918307445960. Its totient is φ = 1918146331368.

The previous prime is 1918226888653. The next prime is 1918226888681. The reversal of 1918226888663 is 3668886228191.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1918226888663 - 2²⁸ = 1917958453207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1918226888593 and 1918226888602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918226888653) 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, 40242920 + ... + 40290557.

It is an arithmetic number, because the mean of its divisors is an integer number (479576861490).

Almost surely, 2^{1918226888663} is an apocalyptic number.

1918226888663 is a deficient number, since it is larger than the sum of its proper divisors (80557297).

1918226888663 is an equidigital number, since it uses as much as digits as its factorization.

1918226888663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80557296.

The product of its digits is 95551488, while the sum is 68.

The spelling of 1918226888663 in words is "one trillion, nine hundred eighteen billion, two hundred twenty-six million, eight hundred eighty-eight thousand, six hundred sixty-three".