201639783816 has 48 divisors (see below), whose sum is σ = 546519542400. Its totient is φ = 67162578912.

The previous prime is 201639783773. The next prime is 201639783823. The reversal of 201639783816 is 618387936102.

201639783816 is a `hidden beast` number, since 201 + 6 + 397 + 8 + 38 + 16 = 666.

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, 959676 + ... + 1150763.

It is an arithmetic number, because the mean of its divisors is an integer number (11385823800).

Almost surely, 2^201639783816 is an apocalyptic number.

It is an amenable number.

201639783816 is an abundant number, since it is smaller than the sum of its proper divisors (344879758584).

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

201639783816 is a wasteful number, since it uses less digits than its factorization.

201639783816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111778 (or 2111771 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 201639783816 in words is "two hundred one billion, six hundred thirty-nine million, seven hundred eighty-three thousand, eight hundred sixteen".