1664666135 has 16 divisors (see below), whose sum is σ = 2220320160. Its totient is φ = 1187821440.

The previous prime is 1664666131. The next prime is 1664666141. The reversal of 1664666135 is 5316664661.

It is not a de Polignac number, because 1664666135 - 2² = 1664666131 is a prime.

It is a super-2 number, since 2×1664666135² = 5542226682031676450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664666131) 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, 282620 + ... + 288449.

It is an arithmetic number, because the mean of its divisors is an integer number (138770010).

Almost surely, 2^1664666135 is an apocalyptic number.

1664666135 is a deficient number, since it is larger than the sum of its proper divisors (555654025).

1664666135 is a wasteful number, since it uses less digits than its factorization.

1664666135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571138.

The product of its digits is 466560, while the sum is 44.

The square root of 1664666135 is about 40800.3202806056. The cubic root of 1664666135 is about 1185.1565330555.

The spelling of 1664666135 in words is "one billion, six hundred sixty-four million, six hundred sixty-six thousand, one hundred thirty-five".