221650211166 has 16 divisors (see below), whose sum is σ = 443486010000. Its totient is φ = 73852472448.

The previous prime is 221650211149. The next prime is 221650211197. The reversal of 221650211166 is 661112056122.

It is a super-2 number, since 2×221650211166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7717291 + ... + 7745958.

It is an arithmetic number, because the mean of its divisors is an integer number (27717875625).

Almost surely, 2^221650211166 is an apocalyptic number.

221650211166 is an abundant number, since it is smaller than the sum of its proper divisors (221835798834).

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

221650211166 is a wasteful number, since it uses less digits than its factorization.

221650211166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15465643.

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 221650211166 its reverse (661112056122), we get a palindrome (882762267288).

The spelling of 221650211166 in words is "two hundred twenty-one billion, six hundred fifty million, two hundred eleven thousand, one hundred sixty-six".