7665681 has 4 divisors (see below), whose sum is σ = 10220912. Its totient is φ = 5110452.

The previous prime is 7665667. The next prime is 7665703. The reversal of 7665681 is 1865667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7665681 - 2¹¹ = 7663633 is a prime.

It is a super-2 number, since 2×7665681² = 117525330387522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7665641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277611 + ... + 1277616.

It is an arithmetic number, because the mean of its divisors is an integer number (2555228).

Almost surely, 2^7665681 is an apocalyptic number.

It is an amenable number.

7665681 is a deficient number, since it is larger than the sum of its proper divisors (2555231).

7665681 is a wasteful number, since it uses less digits than its factorization.

7665681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555230.

The product of its digits is 60480, while the sum is 39.

The square root of 7665681 is about 2768.6966247677. The cubic root of 7665681 is about 197.1742726813.

The spelling of 7665681 in words is "seven million, six hundred sixty-five thousand, six hundred eighty-one".