1663146805 has 8 divisors (see below), whose sum is σ = 2113174872. Its totient is φ = 1252251648.

The previous prime is 1663146773. The next prime is 1663146887. The reversal of 1663146805 is 5086413661.

It can be written as a sum of positive squares in 4 ways, for example, as 340660849 + 1322485956 = 18457^2 + 36366^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663146805 - 2⁵ = 1663146773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9783132 + ... + 9783301.

It is an arithmetic number, because the mean of its divisors is an integer number (264146859).

Almost surely, 2^1663146805 is an apocalyptic number.

It is an amenable number.

1663146805 is a deficient number, since it is larger than the sum of its proper divisors (450028067).

1663146805 is a wasteful number, since it uses less digits than its factorization.

1663146805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566455.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1663146805 is about 40781.6969362483. The cubic root of 1663146805 is about 1184.7958617418.

It can be divided in two parts, 16631 and 46805, that added together give a palindrome (63436).

The spelling of 1663146805 in words is "one billion, six hundred sixty-three million, one hundred forty-six thousand, eight hundred five".