216610599987 has 18 divisors (see below), whose sum is σ = 314767106108. Its totient is φ = 143542187352.

The previous prime is 216610599971. The next prime is 216610600027. The reversal of 216610599987 is 789995016612.

216610599987 is a `hidden beast` number, since 2 + 1 + 6 + 610 + 5 + 9 + 9 + 9 + 8 + 7 = 666.

It is not a de Polignac number, because 216610599987 - 2⁴ = 216610599971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216610599187) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 180493 + ... + 682494.

Almost surely, 2^216610599987 is an apocalyptic number.

216610599987 is a deficient number, since it is larger than the sum of its proper divisors (98156506121).

216610599987 is an equidigital number, since it uses as much as digits as its factorization.

216610599987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863327 (or 863157 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 216610599987 in words is "two hundred sixteen billion, six hundred ten million, five hundred ninety-nine thousand, nine hundred eighty-seven".