1821428722608 has 40 divisors (see below), whose sum is σ = 5133117310656. Its totient is φ = 551948097600.

The previous prime is 1821428722579. The next prime is 1821428722613. The reversal of 1821428722608 is 8062278241281.

It is a super-2 number, since 2×1821428722608² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1724837278 + ... + 1724838333.

Almost surely, 2^{1821428722608} is an apocalyptic number.

It is an amenable number.

1821428722608 is an abundant number, since it is smaller than the sum of its proper divisors (3311688588048).

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

1821428722608 is a wasteful number, since it uses less digits than its factorization.

1821428722608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449675633 (or 3449675627 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 51.

The spelling of 1821428722608 in words is "one trillion, eight hundred twenty-one billion, four hundred twenty-eight million, seven hundred twenty-two thousand, six hundred eight".