6650720651 has 4 divisors (see below), whose sum is σ = 7000758600. Its totient is φ = 6300682704.

The previous prime is 6650720611. The next prime is 6650720669. The reversal of 6650720651 is 1560270566.

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

It is a cyclic number.

It is not a de Polignac number, because 6650720651 - 2²⁶ = 6583611787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6650720611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175018946 + ... + 175018983.

It is an arithmetic number, because the mean of its divisors is an integer number (1750189650).

Almost surely, 2^6650720651 is an apocalyptic number.

6650720651 is a deficient number, since it is larger than the sum of its proper divisors (350037949).

6650720651 is a wasteful number, since it uses less digits than its factorization.

6650720651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350037948.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 6650720651 is about 81551.9506265791. The cubic root of 6650720651 is about 1880.5702822321.

The spelling of 6650720651 in words is "six billion, six hundred fifty million, seven hundred twenty thousand, six hundred fifty-one".