1016665221 has 16 divisors (see below), whose sum is σ = 1592539200. Its totient is φ = 568763520.

The previous prime is 1016665219. The next prime is 1016665249. The reversal of 1016665221 is 1225666101.

It is not a de Polignac number, because 1016665221 - 2¹ = 1016665219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016665291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1184496 + ... + 1185353.

It is an arithmetic number, because the mean of its divisors is an integer number (99533700).

Almost surely, 2^1016665221 is an apocalyptic number.

1016665221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1016665221 is a deficient number, since it is larger than the sum of its proper divisors (575873979).

1016665221 is a wasteful number, since it uses less digits than its factorization.

1016665221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369876.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1016665221 is about 31885.1881129781. The cubic root of 1016665221 is about 1005.5244973925.

The spelling of 1016665221 in words is "one billion, sixteen million, six hundred sixty-five thousand, two hundred twenty-one".