221605557116 has 6 divisors (see below), whose sum is σ = 387809724960. Its totient is φ = 110802778556.

The previous prime is 221605557077. The next prime is 221605557137. The reversal of 221605557116 is 611755506122.

It is a super-3 number, since 3×221605557116³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27700694636 + ... + 27700694643.

It is an arithmetic number, because the mean of its divisors is an integer number (64634954160).

Almost surely, 2^221605557116 is an apocalyptic number.

It is an amenable number.

221605557116 is a deficient number, since it is larger than the sum of its proper divisors (166204167844).

221605557116 is a wasteful number, since it uses less digits than its factorization.

221605557116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55401389283 (or 55401389281 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 221605557116 in words is "two hundred twenty-one billion, six hundred five million, five hundred fifty-seven thousand, one hundred sixteen".