7660666221 has 32 divisors (see below), whose sum is σ = 11891859840. Its totient is φ = 4345415424.

The previous prime is 7660666207. The next prime is 7660666243. The reversal of 7660666221 is 1226660667.

It is not a de Polignac number, because 7660666221 - 2⁷ = 7660666093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7660666271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112290 + ... + 167123.

It is an arithmetic number, because the mean of its divisors is an integer number (371620620).

Almost surely, 2^7660666221 is an apocalyptic number.

It is an amenable number.

7660666221 is a deficient number, since it is larger than the sum of its proper divisors (4231193619).

7660666221 is a wasteful number, since it uses less digits than its factorization.

7660666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279485.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 7660666221 is about 87525.2319105754. The cubic root of 7660666221 is about 1971.3126710459.

The spelling of 7660666221 in words is "seven billion, six hundred sixty million, six hundred sixty-six thousand, two hundred twenty-one".