6501666000 has 80 divisors (see below), whose sum is σ = 20961390528. Its totient is φ = 1733776000.

The previous prime is 6501665987. The next prime is 6501666097. The reversal of 6501666000 is 6661056.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535806 + ... + 547805.

Almost surely, 2^6501666000 is an apocalyptic number.

6501666000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6501666000 is an abundant number, since it is smaller than the sum of its proper divisors (14459724528).

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

6501666000 is a wasteful number, since it uses less digits than its factorization.

6501666000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083637 (or 1083621 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 6501666000 is about 80632.9089144129. The cubic root of 6501666000 is about 1866.4150100084.

The spelling of 6501666000 in words is "six billion, five hundred one million, six hundred sixty-six thousand".