7520206661 has 32 divisors (see below), whose sum is σ = 8784433152. Its totient is φ = 6369168960.

The previous prime is 7520206621. The next prime is 7520206693. The reversal of 7520206661 is 1666020257.

7520206661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-7520206661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7520206621) 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 31 ways as a sum of consecutive naturals, for example, 5036231 + ... + 5037723.

It is an arithmetic number, because the mean of its divisors is an integer number (274513536).

Almost surely, 2^7520206661 is an apocalyptic number.

It is an amenable number.

7520206661 is a deficient number, since it is larger than the sum of its proper divisors (1264226491).

7520206661 is a wasteful number, since it uses less digits than its factorization.

7520206661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 7520206661 is about 86719.1251166662. The cubic root of 7520206661 is about 1959.1901642742.

The spelling of 7520206661 in words is "seven billion, five hundred twenty million, two hundred six thousand, six hundred sixty-one".