218818821164 has 12 divisors (see below), whose sum is σ = 382951716000. Its totient is φ = 109404045168.

The previous prime is 218818821163. The next prime is 218818821167. The reversal of 218818821164 is 461128818812.

It is a happy number.

It is a super-2 number, since 2×218818821164² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218818821163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1248884 + ... + 1413275.

It is an arithmetic number, because the mean of its divisors is an integer number (31912643000).

Almost surely, 2^218818821164 is an apocalyptic number.

It is an amenable number.

218818821164 is a deficient number, since it is larger than the sum of its proper divisors (164132894836).

218818821164 is a wasteful number, since it uses less digits than its factorization.

218818821164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682712 (or 2682710 counting only the distinct ones).

The product of its digits is 393216, while the sum is 50.

The spelling of 218818821164 in words is "two hundred eighteen billion, eight hundred eighteen million, eight hundred twenty-one thousand, one hundred sixty-four".