221565710100660 has 48 divisors (see below), whose sum is σ = 621518145573696. Its totient is φ = 58976174380032.

The previous prime is 221565710100653. The next prime is 221565710100673. The reversal of 221565710100660 is 66001017565122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3375435037 + ... + 3375500676.

It is an arithmetic number, because the mean of its divisors is an integer number (12948294699452).

Almost surely, 2^{221565710100660} is an apocalyptic number.

221565710100660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221565710100660 is an abundant number, since it is smaller than the sum of its proper divisors (399952435473036).

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

221565710100660 is a wasteful number, since it uses less digits than its factorization.

221565710100660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750936272 (or 6750936270 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

Adding to 221565710100660 its reverse (66001017565122), we get a palindrome (287566727665782).

The spelling of 221565710100660 in words is "two hundred twenty-one trillion, five hundred sixty-five billion, seven hundred ten million, one hundred thousand, six hundred sixty".