6765660557 has 2 divisors, whose sum is σ = 6765660558. Its totient is φ = 6765660556.

The previous prime is 6765660553. The next prime is 6765660593. The reversal of 6765660557 is 7550665676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5820774436 + 944886121 = 76294^2 + 30739^2 .

It is a cyclic number.

It is not a de Polignac number, because 6765660557 - 2² = 6765660553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6765660499 and 6765660508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6765660553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3382830278 + 3382830279.

It is an arithmetic number, because the mean of its divisors is an integer number (3382830279).

Almost surely, 2^6765660557 is an apocalyptic number.

It is an amenable number.

6765660557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6765660557 is an equidigital number, since it uses as much as digits as its factorization.

6765660557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938000, while the sum is 53.

The square root of 6765660557 is about 82253.6355245165. The cubic root of 6765660557 is about 1891.3420063847.

The spelling of 6765660557 in words is "six billion, seven hundred sixty-five million, six hundred sixty thousand, five hundred fifty-seven".