7685845521 has 8 divisors (see below), whose sum is σ = 10280535840. Its totient is φ = 5107526112.

The previous prime is 7685845507. The next prime is 7685845523. The reversal of 7685845521 is 1255485867.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7685845521 - 2⁹ = 7685845009 is a prime.

It is a super-2 number, since 2×7685845521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7685845523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4091631 + ... + 4093508.

It is an arithmetic number, because the mean of its divisors is an integer number (1285066980).

Almost surely, 2^7685845521 is an apocalyptic number.

It is an amenable number.

7685845521 is a deficient number, since it is larger than the sum of its proper divisors (2594690319).

7685845521 is a wasteful number, since it uses less digits than its factorization.

7685845521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185455.

The product of its digits is 2688000, while the sum is 51.

The square root of 7685845521 is about 87668.9541456952. The cubic root of 7685845521 is about 1973.4700982988.

The spelling of 7685845521 in words is "seven billion, six hundred eighty-five million, eight hundred forty-five thousand, five hundred twenty-one".