1778222446561 has 8 divisors (see below), whose sum is σ = 1940022900000. Its totient is φ = 1616445971040.

The previous prime is 1778222446529. The next prime is 1778222446603. The reversal of 1778222446561 is 1656442228771.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1778222446561 - 2⁵ = 1778222446529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1778222446061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5839236 + ... + 6136213.

It is an arithmetic number, because the mean of its divisors is an integer number (242502862500).

Almost surely, 2^{1778222446561} is an apocalyptic number.

1778222446561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1778222446561 is a deficient number, since it is larger than the sum of its proper divisors (161800453439).

1778222446561 is a wasteful number, since it uses less digits than its factorization.

1778222446561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11988959.

The product of its digits is 9031680, while the sum is 55.

The spelling of 1778222446561 in words is "one trillion, seven hundred seventy-eight billion, two hundred twenty-two million, four hundred forty-six thousand, five hundred sixty-one".