215088917985 has 12 divisors (see below), whose sum is σ = 372820791252. Its totient is φ = 114714089568.

The previous prime is 215088917969. The next prime is 215088918061. The reversal of 215088917985 is 589719880512.

215088917985 is a `hidden beast` number, since 21 + 508 + 8 + 9 + 17 + 98 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46207371681 + 168881546304 = 214959^2 + 410952^2 .

It is not a de Polignac number, because 215088917985 - 2⁴ = 215088917969 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

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, 2389876822 + ... + 2389876911.

It is an arithmetic number, because the mean of its divisors is an integer number (31068399271).

Almost surely, 2^215088917985 is an apocalyptic number.

It is an amenable number.

215088917985 is a deficient number, since it is larger than the sum of its proper divisors (157731873267).

215088917985 is a wasteful number, since it uses less digits than its factorization.

215088917985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779753744 (or 4779753741 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 63.

The spelling of 215088917985 in words is "two hundred fifteen billion, eighty-eight million, nine hundred seventeen thousand, nine hundred eighty-five".