221601655065 has 64 divisors (see below), whose sum is σ = 409580365824. Its totient is φ = 100213106688.

The previous prime is 221601655043. The next prime is 221601655081. The reversal of 221601655065 is 560556106122.

It is a happy number.

It is not a de Polignac number, because 221601655065 - 2¹⁴ = 221601638681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32456182 + ... + 32463008.

It is an arithmetic number, because the mean of its divisors is an integer number (6399693216).

Almost surely, 2^221601655065 is an apocalyptic number.

It is an amenable number.

221601655065 is a deficient number, since it is larger than the sum of its proper divisors (187978710759).

221601655065 is a wasteful number, since it uses less digits than its factorization.

221601655065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10126.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 221601655065 in words is "two hundred twenty-one billion, six hundred one million, six hundred fifty-five thousand, sixty-five".