7656017665 has 8 divisors (see below), whose sum is σ = 9191788200. Its totient is φ = 6121769472.

The previous prime is 7656017651. The next prime is 7656017683. The reversal of 7656017665 is 5667106567.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 338412816 + 7317604849 = 18396^2 + 85543^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7656017665 - 2¹⁷ = 7655886593 is a prime.

It is a super-2 number, since 2×7656017665² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369490 + ... + 389659.

It is an arithmetic number, because the mean of its divisors is an integer number (1148973525).

Almost surely, 2^7656017665 is an apocalyptic number.

It is an amenable number.

7656017665 is a deficient number, since it is larger than the sum of its proper divisors (1535770535).

7656017665 is a wasteful number, since it uses less digits than its factorization.

7656017665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761171.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The square root of 7656017665 is about 87498.6723613564. The cubic root of 7656017665 is about 1970.9138540564.

The spelling of 7656017665 in words is "seven billion, six hundred fifty-six million, seventeen thousand, six hundred sixty-five".