215005205650 has 24 divisors (see below), whose sum is σ = 399928151844. Its totient is φ = 85998110400.

The previous prime is 215005205641. The next prime is 215005205693. The reversal of 215005205650 is 56502500512.

It can be written as a sum of positive squares in 6 ways, for example, as 54253123929 + 160752081721 = 232923^2 + 400939^2 .

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 11 ways as a sum of consecutive naturals, for example, 1149720 + ... + 1323580.

Almost surely, 2^215005205650 is an apocalyptic number.

215005205650 is a deficient number, since it is larger than the sum of its proper divisors (184922946194).

215005205650 is a wasteful number, since it uses less digits than its factorization.

215005205650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198606 (or 198601 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 215005205650 in words is "two hundred fifteen billion, five million, two hundred five thousand, six hundred fifty".