664600016 has 10 divisors (see below), whose sum is σ = 1287662562. Its totient is φ = 332300000.

The previous prime is 664600003. The next prime is 664600021. The reversal of 664600016 is 610006466.

It can be written as a sum of positive squares in only one way, i.e., 590295616 + 74304400 = 24296^2 + 8620^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20768735 + ... + 20768766.

Almost surely, 2^664600016 is an apocalyptic number.

It is an amenable number.

664600016 is a deficient number, since it is larger than the sum of its proper divisors (623062546).

664600016 is a wasteful number, since it uses less digits than its factorization.

664600016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41537509 (or 41537503 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 664600016 is about 25779.8373928153. The cubic root of 664600016 is about 872.6768375263.

The spelling of 664600016 in words is "six hundred sixty-four million, six hundred thousand, sixteen".