1821222945648 has 60 divisors (see below), whose sum is σ = 5121050756328. Its totient is φ = 604197175680.

The previous prime is 1821222945589. The next prime is 1821222945667. The reversal of 1821222945648 is 8465492221281.

It is a happy number.

1821222945648 is a `hidden beast` number, since 1 + 8 + 2 + 122 + 29 + 456 + 48 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1821222945594 and 1821222945603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29939715 + ... + 30000482.

Almost surely, 2^{1821222945648} is an apocalyptic number.

1821222945648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1821222945648 is an abundant number, since it is smaller than the sum of its proper divisors (3299827810680).

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

1821222945648 is a wasteful number, since it uses less digits than its factorization.

1821222945648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59940422 (or 59940413 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The spelling of 1821222945648 in words is "one trillion, eight hundred twenty-one billion, two hundred twenty-two million, nine hundred forty-five thousand, six hundred forty-eight".