1809868664 has 16 divisors (see below), whose sum is σ = 3404350320. Its totient is φ = 902041920.

The previous prime is 1809868657. The next prime is 1809868673. The reversal of 1809868664 is 4668689081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358892 + ... + 363899.

It is an arithmetic number, because the mean of its divisors is an integer number (212771895).

Almost surely, 2^1809868664 is an apocalyptic number.

It is an amenable number.

1809868664 is a deficient number, since it is larger than the sum of its proper divisors (1594481656).

1809868664 is a wasteful number, since it uses less digits than its factorization.

1809868664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723110 (or 723106 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The square root of 1809868664 is about 42542.5512163998. The cubic root of 1809868664 is about 1218.6594304680.

The spelling of 1809868664 in words is "one billion, eight hundred nine million, eight hundred sixty-eight thousand, six hundred sixty-four".