1818621563514 has 48 divisors (see below), whose sum is σ = 4259099232576. Its totient is φ = 516165048000.

The previous prime is 1818621563489. The next prime is 1818621563531. The reversal of 1818621563514 is 4153651268181.

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 23 ways as a sum of consecutive naturals, for example, 20438347 + ... + 20527134.

It is an arithmetic number, because the mean of its divisors is an integer number (88731234012).

Almost surely, 2^{1818621563514} is an apocalyptic number.

1818621563514 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1818621563514 is an abundant number, since it is smaller than the sum of its proper divisors (2440477669062).

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

1818621563514 is a wasteful number, since it uses less digits than its factorization.

1818621563514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40965651 (or 40965644 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The spelling of 1818621563514 in words is "one trillion, eight hundred eighteen billion, six hundred twenty-one million, five hundred sixty-three thousand, five hundred fourteen".