216404858187 has 48 divisors (see below), whose sum is σ = 378730340352. Its totient is φ = 116436502080.

The previous prime is 216404858177. The next prime is 216404858191. The reversal of 216404858187 is 781858404612.

216404858187 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 0 + 485 + 81 + 87 = 666.

It is not a de Polignac number, because 216404858187 - 2¹² = 216404854091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216404858167) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1425123 + ... + 1569644.

It is an arithmetic number, because the mean of its divisors is an integer number (7890215424).

Almost surely, 2^216404858187 is an apocalyptic number.

216404858187 is a deficient number, since it is larger than the sum of its proper divisors (162325482165).

216404858187 is a wasteful number, since it uses less digits than its factorization.

216404858187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994848 (or 2994845 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 216404858187 in words is "two hundred sixteen billion, four hundred four million, eight hundred fifty-eight thousand, one hundred eighty-seven".