1664668535 has 8 divisors (see below), whose sum is σ = 2062041216. Its totient is φ = 1288775520.

The previous prime is 1664668531. The next prime is 1664668541. The reversal of 1664668535 is 5358664661.

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

It is not a de Polignac number, because 1664668535 - 2² = 1664668531 is a prime.

It is a super-2 number, since 2×1664668535² = 5542242662838092450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664668531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5369744 + ... + 5370053.

It is an arithmetic number, because the mean of its divisors is an integer number (257755152).

Almost surely, 2^1664668535 is an apocalyptic number.

1664668535 is a deficient number, since it is larger than the sum of its proper divisors (397372681).

1664668535 is a wasteful number, since it uses less digits than its factorization.

1664668535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10739833.

The product of its digits is 3110400, while the sum is 50.

The square root of 1664668535 is about 40800.3496921289. The cubic root of 1664668535 is about 1185.1571026140.

The spelling of 1664668535 in words is "one billion, six hundred sixty-four million, six hundred sixty-eight thousand, five hundred thirty-five".