7666635861 has 12 divisors (see below), whose sum is σ = 11078222688. Its totient is φ = 5109155304.

The previous prime is 7666635829. The next prime is 7666635863. The reversal of 7666635861 is 1685366667.

It is not a de Polignac number, because 7666635861 - 2⁵ = 7666635829 is a prime.

It is a super-4 number, since 4×7666635861⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 7666635798 and 7666635807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7666635863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135975 + ... + 183908.

It is an arithmetic number, because the mean of its divisors is an integer number (923185224).

Almost surely, 2^7666635861 is an apocalyptic number.

It is an amenable number.

7666635861 is a deficient number, since it is larger than the sum of its proper divisors (3411586827).

7666635861 is a wasteful number, since it uses less digits than its factorization.

7666635861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322552 (or 322549 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 7666635861 is about 87559.3276641615. The cubic root of 7666635861 is about 1971.8245922104.

The spelling of 7666635861 in words is "seven billion, six hundred sixty-six million, six hundred thirty-five thousand, eight hundred sixty-one".