6656756965 has 4 divisors (see below), whose sum is σ = 7988108364. Its totient is φ = 5325405568.

The previous prime is 6656756959. The next prime is 6656756983. The reversal of 6656756965 is 5696576566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1598560324 + 5058196641 = 39982^2 + 71121^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656756965 - 2³ = 6656756957 is a prime.

It is a super-2 number, since 2×6656756965² = 88624826582152022450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665675692 + ... + 665675701.

It is an arithmetic number, because the mean of its divisors is an integer number (1997027091).

Almost surely, 2^6656756965 is an apocalyptic number.

It is an amenable number.

6656756965 is a deficient number, since it is larger than the sum of its proper divisors (1331351399).

6656756965 is a wasteful number, since it uses less digits than its factorization.

6656756965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331351398.

The product of its digits is 61236000, while the sum is 61.

The square root of 6656756965 is about 81588.9512434129. The cubic root of 6656756965 is about 1881.1390566907.

The spelling of 6656756965 in words is "six billion, six hundred fifty-six million, seven hundred fifty-six thousand, nine hundred sixty-five".