221645266386 has 24 divisors (see below), whose sum is σ = 446808688560. Its totient is φ = 73299977352.

The previous prime is 221645266379. The next prime is 221645266417. The reversal of 221645266386 is 683662546122.

It is a super-2 number, since 2×221645266386² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1048396 + ... + 1241943.

It is an arithmetic number, because the mean of its divisors is an integer number (18617028690).

Almost surely, 2^221645266386 is an apocalyptic number.

221645266386 is an abundant number, since it is smaller than the sum of its proper divisors (225163422174).

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

221645266386 is a wasteful number, since it uses less digits than its factorization.

221645266386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290598 (or 2290471 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 51.

The spelling of 221645266386 in words is "two hundred twenty-one billion, six hundred forty-five million, two hundred sixty-six thousand, three hundred eighty-six".