7688817661 has 16 divisors (see below), whose sum is σ = 8833681408. Its totient is φ = 6555654000.

The previous prime is 7688817611. The next prime is 7688817673. The reversal of 7688817661 is 1667188867.

It is not a de Polignac number, because 7688817661 - 2¹⁷ = 7688686589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7688817596 and 7688817605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688817611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246936 + ... + 1253086.

It is an arithmetic number, because the mean of its divisors is an integer number (552105088).

Almost surely, 2^7688817661 is an apocalyptic number.

It is an amenable number.

7688817661 is a deficient number, since it is larger than the sum of its proper divisors (1144863747).

7688817661 is a wasteful number, since it uses less digits than its factorization.

7688817661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072.

The product of its digits is 5419008, while the sum is 58.

The square root of 7688817661 is about 87685.9034337903. The cubic root of 7688817661 is about 1973.7244478259.

It can be divided in two parts, 76888 and 17661, that added together give a palindrome (94549).

The spelling of 7688817661 in words is "seven billion, six hundred eighty-eight million, eight hundred seventeen thousand, six hundred sixty-one".