6501664404 has 36 divisors (see below), whose sum is σ = 16449981184. Its totient is φ = 2165214672.

The previous prime is 6501664381. The next prime is 6501664409. The reversal of 6501664404 is 4044661056.

6501664404 is a `hidden beast` number, since 6 + 5 + 0 + 1 + 6 + 644 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6501664409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43942 + ... + 122205.

Almost surely, 2^6501664404 is an apocalyptic number.

It is an amenable number.

6501664404 is an abundant number, since it is smaller than the sum of its proper divisors (9948316780).

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

6501664404 is a wasteful number, since it uses less digits than its factorization.

6501664404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167244 (or 167239 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 6501664404 is about 80632.8990177086. The cubic root of 6501664404 is about 1866.4148572886.

The spelling of 6501664404 in words is "six billion, five hundred one million, six hundred sixty-four thousand, four hundred four".