218347867064648 has 16 divisors (see below), whose sum is σ = 416113763054460. Its totient is φ = 107384196916800.

The previous prime is 218347867064611. The next prime is 218347867064653. The reversal of 218347867064648 is 846460768743812.

It can be written as a sum of positive squares in 2 ways, for example, as 217692968554084 + 654898510564 = 14754422^2 + 809258^2 .

It is a super-2 number, since 2×218347867064648² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223717076423 + ... + 223717077398.

Almost surely, 2^{218347867064648} is an apocalyptic number.

It is an amenable number.

218347867064648 is a deficient number, since it is larger than the sum of its proper divisors (197765895989812).

218347867064648 is a wasteful number, since it uses less digits than its factorization.

218347867064648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447434153888 (or 447434153884 counting only the distinct ones).

The product of its (nonzero) digits is 2080899072, while the sum is 74.

The spelling of 218347867064648 in words is "two hundred eighteen trillion, three hundred forty-seven billion, eight hundred sixty-seven million, sixty-four thousand, six hundred forty-eight".