1664440536 has 32 divisors (see below), whose sum is σ = 4539384000. Its totient is φ = 504375840.

The previous prime is 1664440513. The next prime is 1664440553. The reversal of 1664440536 is 6350444661.

It is a super-3 number, since 3×1664440536³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1664440494 and 1664440503.

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, 3152086 + ... + 3152613.

It is an arithmetic number, because the mean of its divisors is an integer number (141855750).

Almost surely, 2^1664440536 is an apocalyptic number.

It is an amenable number.

1664440536 is an abundant number, since it is smaller than the sum of its proper divisors (2874943464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664440536 is a wasteful number, since it uses less digits than its factorization.

1664440536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304719 (or 6304715 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 1664440536 is about 40797.5555150060. Note that the first 4 decimals coincide. The cubic root of 1664440536 is about 1185.1029923480.

The spelling of 1664440536 in words is "one billion, six hundred sixty-four million, four hundred forty thousand, five hundred thirty-six".