216186077 has 4 divisors (see below), whose sum is σ = 216254016. Its totient is φ = 216118140.

The previous prime is 216186067. The next prime is 216186083. The reversal of 216186077 is 770681612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216186077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216186077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216186067) 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 3 ways as a sum of consecutive naturals, for example, 28949 + ... + 35642.

It is an arithmetic number, because the mean of its divisors is an integer number (54063504).

Almost surely, 2^216186077 is an apocalyptic number.

It is an amenable number.

216186077 is a deficient number, since it is larger than the sum of its proper divisors (67939).

216186077 is an equidigital number, since it uses as much as digits as its factorization.

216186077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67938.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 216186077 is about 14703.2675620081. The cubic root of 216186077 is about 600.1722440671.

The spelling of 216186077 in words is "two hundred sixteen million, one hundred eighty-six thousand, seventy-seven".