215683809648 has 40 divisors (see below), whose sum is σ = 557333859600. Its totient is φ = 71875160064.

The previous prime is 215683809629. The next prime is 215683809767. The reversal of 215683809648 is 846908386512.

It is a junction number, because it is equal to n+sod(n) for n = 215683809591 and 215683809600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427713 + ... + 783776.

It is an arithmetic number, because the mean of its divisors is an integer number (13933346490).

Almost surely, 2^215683809648 is an apocalyptic number.

It is an amenable number.

215683809648 is an abundant number, since it is smaller than the sum of its proper divisors (341650049952).

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

215683809648 is a wasteful number, since it uses less digits than its factorization.

215683809648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215209 (or 1215203 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 215683809648 in words is "two hundred fifteen billion, six hundred eighty-three million, eight hundred nine thousand, six hundred forty-eight".