201818787860 has 48 divisors (see below), whose sum is σ = 434238658560. Its totient is φ = 78743650560.

The previous prime is 201818787829. The next prime is 201818787881. The reversal of 201818787860 is 68787818102.

201818787860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 201818787796 and 201818787805.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4964537 + ... + 5005023.

It is an arithmetic number, because the mean of its divisors is an integer number (9046638720).

Almost surely, 2^201818787860 is an apocalyptic number.

201818787860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201818787860 is an abundant number, since it is smaller than the sum of its proper divisors (232419870700).

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

201818787860 is a wasteful number, since it uses less digits than its factorization.

201818787860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46616 (or 46614 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 56.

The spelling of 201818787860 in words is "two hundred one billion, eight hundred eighteen million, seven hundred eighty-seven thousand, eight hundred sixty".