218827226581 has 8 divisors (see below), whose sum is σ = 220288777344. Its totient is φ = 217365838800.

The previous prime is 218827226573. The next prime is 218827226599. The reversal of 218827226581 is 185622728812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218827226581 - 2³ = 218827226573 is a prime.

It is a super-2 number, since 2×218827226581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218827226561) 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, 3952416 + ... + 4007398.

It is an arithmetic number, because the mean of its divisors is an integer number (27536097168).

Almost surely, 2^218827226581 is an apocalyptic number.

It is an amenable number.

218827226581 is a deficient number, since it is larger than the sum of its proper divisors (1461550763).

218827226581 is a wasteful number, since it uses less digits than its factorization.

218827226581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81491.

The product of its digits is 1720320, while the sum is 52.

The spelling of 218827226581 in words is "two hundred eighteen billion, eight hundred twenty-seven million, two hundred twenty-six thousand, five hundred eighty-one".