218196651 has 4 divisors (see below), whose sum is σ = 290928872. Its totient is φ = 145464432.

The previous prime is 218196637. The next prime is 218196673. The reversal of 218196651 is 156691812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218196651 - 2¹⁴ = 218180267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218196611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36366106 + ... + 36366111.

It is an arithmetic number, because the mean of its divisors is an integer number (72732218).

Almost surely, 2^218196651 is an apocalyptic number.

218196651 is a deficient number, since it is larger than the sum of its proper divisors (72732221).

218196651 is an equidigital number, since it uses as much as digits as its factorization.

218196651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72732220.

The product of its digits is 25920, while the sum is 39.

The square root of 218196651 is about 14771.4810022557. The cubic root of 218196651 is about 602.0270799767.

The spelling of 218196651 in words is "two hundred eighteen million, one hundred ninety-six thousand, six hundred fifty-one".