1778042818668 has 24 divisors (see below), whose sum is σ = 4155468963520. Its totient is φ = 591723455760.

The previous prime is 1778042818631. The next prime is 1778042818687. The reversal of 1778042818668 is 8668182408771.

It is a super-2 number, since 2×1778042818668² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1778042818599 and 1778042818608.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 119677738 + ... + 119692593.

Almost surely, 2^{1778042818668} is an apocalyptic number.

It is an amenable number.

1778042818668 is an abundant number, since it is smaller than the sum of its proper divisors (2377426144852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1778042818668 is a wasteful number, since it uses less digits than its factorization.

1778042818668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239370957 (or 239370955 counting only the distinct ones).

The product of its (nonzero) digits is 57802752, while the sum is 66.

The spelling of 1778042818668 in words is "one trillion, seven hundred seventy-eight billion, forty-two million, eight hundred eighteen thousand, six hundred sixty-eight".