1821149651088 has 120 divisors (see below), whose sum is σ = 5402612880288. Its totient is φ = 570693344256.

The previous prime is 1821149651033. The next prime is 1821149651107. The reversal of 1821149651088 is 8801569411281.

1821149651088 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 1 + 49 + 6 + 510 + 88 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1740331 + ... + 2582837.

Almost surely, 2^{1821149651088} is an apocalyptic number.

1821149651088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821149651088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2701306440144).

1821149651088 is an abundant number, since it is smaller than the sum of its proper divisors (3581463229200).

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

1821149651088 is a wasteful number, since it uses less digits than its factorization.

1821149651088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843421 (or 843412 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 54.

The spelling of 1821149651088 in words is "one trillion, eight hundred twenty-one billion, one hundred forty-nine million, six hundred fifty-one thousand, eighty-eight".