7655665559 has 2 divisors, whose sum is σ = 7655665560. Its totient is φ = 7655665558.

The previous prime is 7655665489. The next prime is 7655665571. The reversal of 7655665559 is 9555665567.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7655665559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7655665498 and 7655665507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7655565559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3827832779 + 3827832780.

It is an arithmetic number, because the mean of its divisors is an integer number (3827832780).

Almost surely, 2^7655665559 is an apocalyptic number.

7655665559 is a deficient number, since it is larger than the sum of its proper divisors (1).

7655665559 is an equidigital number, since it uses as much as digits as its factorization.

7655665559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525000, while the sum is 59.

The square root of 7655665559 is about 87496.6602734070. The cubic root of 7655665559 is about 1970.8836389907.

The spelling of 7655665559 in words is "seven billion, six hundred fifty-five million, six hundred sixty-five thousand, five hundred fifty-nine".