1664503009 has 16 divisors (see below), whose sum is σ = 1826087760. Its totient is φ = 1507968000.

The previous prime is 1664502991. The next prime is 1664503019. The reversal of 1664503009 is 9003054661.

It can be written as a sum of positive squares in 8 ways, for example, as 280663009 + 1383840000 = 16753^2 + 37200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664503009 - 2⁵ = 1664502977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664503019) 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, 153259 + ... + 163759.

It is an arithmetic number, because the mean of its divisors is an integer number (114130485).

Almost surely, 2^1664503009 is an apocalyptic number.

It is an amenable number.

1664503009 is a deficient number, since it is larger than the sum of its proper divisors (161584751).

1664503009 is a wasteful number, since it uses less digits than its factorization.

1664503009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10740.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1664503009 is about 40798.3211541848. The cubic root of 1664503009 is about 1185.1178193547.

The spelling of 1664503009 in words is "one billion, six hundred sixty-four million, five hundred three thousand, nine".