1664586516 has 12 divisors (see below), whose sum is σ = 3884035232. Its totient is φ = 554862168.

The previous prime is 1664586503. The next prime is 1664586527. The reversal of 1664586516 is 6156854661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69357760 + ... + 69357783.

Almost surely, 2^1664586516 is an apocalyptic number.

It is an amenable number.

1664586516 is an abundant number, since it is smaller than the sum of its proper divisors (2219448716).

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

1664586516 is a wasteful number, since it uses less digits than its factorization.

1664586516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138715550 (or 138715548 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The square root of 1664586516 is about 40799.3445535587. The cubic root of 1664586516 is about 1185.1376378787.

The spelling of 1664586516 in words is "one billion, six hundred sixty-four million, five hundred eighty-six thousand, five hundred sixteen".