218661012 has 24 divisors (see below), whose sum is σ = 566899200. Its totient is φ = 72886968.

The previous prime is 218661007. The next prime is 218661017. The reversal of 218661012 is 210166812.

It is an interprime number because it is at equal distance from previous prime (218661007) and next prime (218661017).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218661017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1012212 + ... + 1012427.

It is an arithmetic number, because the mean of its divisors is an integer number (23620800).

Almost surely, 2^218661012 is an apocalyptic number.

It is an amenable number.

218661012 is an abundant number, since it is smaller than the sum of its proper divisors (348238188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218661012 is a wasteful number, since it uses less digits than its factorization.

218661012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024652 (or 2024644 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 218661012 is about 14787.1908082638. The cubic root of 218661012 is about 602.4538506803.

The spelling of 218661012 in words is "two hundred eighteen million, six hundred sixty-one thousand, twelve".