216687003685 has 8 divisors (see below), whose sum is σ = 267052091256. Its totient is φ = 168664478400.

The previous prime is 216687003671. The next prime is 216687003697. The reversal of 216687003685 is 586300786612.

It can be written as a sum of positive squares in 4 ways, for example, as 71292738049 + 145394265636 = 267007^2 + 381306^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216687003685 - 2⁷ = 216687003557 is a prime.

It is a super-3 number, since 3×216687003685³ (a number of 35 digits) contains 333 as substring.

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, 585640366 + ... + 585640735.

It is an arithmetic number, because the mean of its divisors is an integer number (33381511407).

Almost surely, 2^216687003685 is an apocalyptic number.

It is an amenable number.

216687003685 is a deficient number, since it is larger than the sum of its proper divisors (50365087571).

216687003685 is a wasteful number, since it uses less digits than its factorization.

216687003685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171281143.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 216687003685 in words is "two hundred sixteen billion, six hundred eighty-seven million, three thousand, six hundred eighty-five".