221601655068 has 12 divisors (see below), whose sum is σ = 517070528520. Its totient is φ = 73867218352.

The previous prime is 221601655043. The next prime is 221601655081. The reversal of 221601655068 is 860556106122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9233402283 + ... + 9233402306.

It is an arithmetic number, because the mean of its divisors is an integer number (43089210710).

Almost surely, 2^221601655068 is an apocalyptic number.

It is an amenable number.

221601655068 is an abundant number, since it is smaller than the sum of its proper divisors (295468873452).

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

221601655068 is a wasteful number, since it uses less digits than its factorization.

221601655068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18466804596 (or 18466804594 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 221601655068 in words is "two hundred twenty-one billion, six hundred one million, six hundred fifty-five thousand, sixty-eight".