6500661001 has 4 divisors (see below), whose sum is σ = 6501664404. Its totient is φ = 6499657600.

The previous prime is 6500660981. The next prime is 6500661019. The reversal of 6500661001 is 1001660056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5821537401 + 679123600 = 76299^2 + 26060^2 .

It is a cyclic number.

It is not a de Polignac number, because 6500661001 - 2⁹ = 6500660489 is a prime.

It is a super-3 number, since 3×6500661001³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6500661061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491920 + ... + 504961.

It is an arithmetic number, because the mean of its divisors is an integer number (1625416101).

Almost surely, 2^6500661001 is an apocalyptic number.

It is an amenable number.

6500661001 is a deficient number, since it is larger than the sum of its proper divisors (1003403).

6500661001 is an equidigital number, since it uses as much as digits as its factorization.

6500661001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003402.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6500661001 is about 80626.6767329524. The cubic root of 6500661001 is about 1866.3188376389.

The spelling of 6500661001 in words is "six billion, five hundred million, six hundred sixty-one thousand, one".