218534921516 has 6 divisors (see below), whose sum is σ = 382436112660. Its totient is φ = 109267460756.

The previous prime is 218534921489. The next prime is 218534921543. The reversal of 218534921516 is 615129435812.

It is an interprime number because it is at equal distance from previous prime (218534921489) and next prime (218534921543).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27316865186 + ... + 27316865193.

It is an arithmetic number, because the mean of its divisors is an integer number (63739352110).

Almost surely, 2^218534921516 is an apocalyptic number.

It is an amenable number.

218534921516 is a deficient number, since it is larger than the sum of its proper divisors (163901191144).

218534921516 is a wasteful number, since it uses less digits than its factorization.

218534921516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54633730383 (or 54633730381 counting only the distinct ones).

The product of its digits is 518400, while the sum is 47.

The spelling of 218534921516 in words is "two hundred eighteen billion, five hundred thirty-four million, nine hundred twenty-one thousand, five hundred sixteen".