221550166999 has 16 divisors (see below), whose sum is σ = 263665912320. Its totient is φ = 182137586400.

The previous prime is 221550166979. The next prime is 221550167017. The reversal of 221550166999 is 999661055122.

It is not a de Polignac number, because 221550166999 - 2¹¹ = 221550164951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221550166979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3583189 + ... + 3644494.

It is an arithmetic number, because the mean of its divisors is an integer number (16479119520).

Almost surely, 2^221550166999 is an apocalyptic number.

221550166999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

221550166999 is a deficient number, since it is larger than the sum of its proper divisors (42115745321).

221550166999 is a wasteful number, since it uses less digits than its factorization.

221550166999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7227870.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The spelling of 221550166999 in words is "two hundred twenty-one billion, five hundred fifty million, one hundred sixty-six thousand, nine hundred ninety-nine".