221601655066 has 32 divisors (see below), whose sum is σ = 383023466496. Its totient is φ = 95211774000.

The previous prime is 221601655043. The next prime is 221601655081. The reversal of 221601655066 is 660556106122.

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, 3748920 + ... + 3807571.

It is an arithmetic number, because the mean of its divisors is an integer number (11969483328).

Almost surely, 2^221601655066 is an apocalyptic number.

221601655066 is a deficient number, since it is larger than the sum of its proper divisors (161421811430).

221601655066 is a wasteful number, since it uses less digits than its factorization.

221601655066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7556578.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 221601655066 in words is "two hundred twenty-one billion, six hundred one million, six hundred fifty-five thousand, sixty-six".