1662021105 has 16 divisors (see below), whose sum is σ = 2799193920. Its totient is φ = 839757888.

The previous prime is 1662021083. The next prime is 1662021113. The reversal of 1662021105 is 5011202661.

It is not a de Polignac number, because 1662021105 - 2⁶ = 1662021041 is a prime.

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, 2915542 + ... + 2916111.

It is an arithmetic number, because the mean of its divisors is an integer number (174949620).

Almost surely, 2^1662021105 is an apocalyptic number.

1662021105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1662021105 is a deficient number, since it is larger than the sum of its proper divisors (1137172815).

1662021105 is a wasteful number, since it uses less digits than its factorization.

1662021105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5831680.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1662021105 is about 40767.8930654995. The cubic root of 1662021105 is about 1184.5284919339.

Adding to 1662021105 its reverse (5011202661), we get a palindrome (6673223766).

The spelling of 1662021105 in words is "one billion, six hundred sixty-two million, twenty-one thousand, one hundred five".