216186491697 has 16 divisors (see below), whose sum is σ = 314827914240. Its totient is φ = 130865934800.

The previous prime is 216186491687. The next prime is 216186491711. The reversal of 216186491697 is 796194681612.

It is a cyclic number.

It is not a de Polignac number, because 216186491697 - 2¹⁶ = 216186426161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216186491697.

It is not an unprimeable number, because it can be changed into a prime (216186491627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3876429 + ... + 3931802.

It is an arithmetic number, because the mean of its divisors is an integer number (19676744640).

Almost surely, 2^216186491697 is an apocalyptic number.

It is an amenable number.

216186491697 is a deficient number, since it is larger than the sum of its proper divisors (98641422543).

216186491697 is a wasteful number, since it uses less digits than its factorization.

216186491697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7809084.

The product of its digits is 7838208, while the sum is 60.

The spelling of 216186491697 in words is "two hundred sixteen billion, one hundred eighty-six million, four hundred ninety-one thousand, six hundred ninety-seven".