7685906221 has 12 divisors (see below), whose sum is σ = 9249051420. Its totient is φ = 6360748800.

The previous prime is 7685906213. The next prime is 7685906309. The reversal of 7685906221 is 1226095867.

It can be written as a sum of positive squares in 2 ways, for example, as 1207910025 + 6477996196 = 34755^2 + 80486^2 .

It is not a de Polignac number, because 7685906221 - 2³ = 7685906213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7685906321) 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 11 ways as a sum of consecutive naturals, for example, 2702980 + ... + 2705821.

It is an arithmetic number, because the mean of its divisors is an integer number (770754285).

Almost surely, 2^7685906221 is an apocalyptic number.

It is an amenable number.

7685906221 is a deficient number, since it is larger than the sum of its proper divisors (1563145199).

7685906221 is a wasteful number, since it uses less digits than its factorization.

7685906221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408844 (or 5408837 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 7685906221 is about 87669.3003336972. The cubic root of 7685906221 is about 1973.4752935338.

The spelling of 7685906221 in words is "seven billion, six hundred eighty-five million, nine hundred six thousand, two hundred twenty-one".