218522367842 has 4 divisors (see below), whose sum is σ = 327783551766. Its totient is φ = 109261183920.

The previous prime is 218522367841. The next prime is 218522367857. The reversal of 218522367842 is 248763225812.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 116602443841 + 101919924001 = 341471^2 + 319249^2 .

It is not an unprimeable number, because it can be changed into a prime (218522367841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54630591959 + ... + 54630591962.

Almost surely, 2^218522367842 is an apocalyptic number.

218522367842 is a deficient number, since it is larger than the sum of its proper divisors (109261183924).

218522367842 is a wasteful number, since it uses less digits than its factorization.

218522367842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109261183923.

The product of its digits is 2580480, while the sum is 50.

The spelling of 218522367842 in words is "two hundred eighteen billion, five hundred twenty-two million, three hundred sixty-seven thousand, eight hundred forty-two".