6500006661672 has 24 divisors (see below), whose sum is σ = 17604184708890. Its totient is φ = 2166668887200.

The previous prime is 6500006661661. The next prime is 6500006661691. The reversal of 6500006661672 is 2761666000056.

It can be written as a sum of positive squares in only one way, i.e., 5778706363236 + 721300298436 = 2403894^2 + 849294^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45138935079 + ... + 45138935222.

Almost surely, 2^{6500006661672} is an apocalyptic number.

It is an amenable number.

6500006661672 is an abundant number, since it is smaller than the sum of its proper divisors (11104178047218).

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

6500006661672 is a wasteful number, since it uses less digits than its factorization.

6500006661672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90277870313 (or 90277870306 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 6500006661672 in words is "six trillion, five hundred billion, six million, six hundred sixty-one thousand, six hundred seventy-two".