218142557 has 8 divisors (see below), whose sum is σ = 232471296. Its totient is φ = 204217552.

The previous prime is 218142539. The next prime is 218142563. The reversal of 218142557 is 755241812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218142557 - 2⁶ = 218142493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218142577) 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 7 ways as a sum of consecutive naturals, for example, 99818 + ... + 101979.

It is an arithmetic number, because the mean of its divisors is an integer number (29058912).

Almost surely, 2^218142557 is an apocalyptic number.

It is an amenable number.

218142557 is a deficient number, since it is larger than the sum of its proper divisors (14328739).

218142557 is a wasteful number, since it uses less digits than its factorization.

218142557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201867.

The product of its digits is 22400, while the sum is 35.

The square root of 218142557 is about 14769.6498604402. The cubic root of 218142557 is about 601.9773255552.

The spelling of 218142557 in words is "two hundred eighteen million, one hundred forty-two thousand, five hundred fifty-seven".