2688804557 has 2 divisors, whose sum is σ = 2688804558. Its totient is φ = 2688804556.

The previous prime is 2688804511. The next prime is 2688804583. The reversal of 2688804557 is 7554088862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2517430276 + 171374281 = 50174^2 + 13091^2 .

It is a cyclic number.

It is not a de Polignac number, because 2688804557 - 2⁶ = 2688804493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2688804499 and 2688804508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2688804257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344402278 + 1344402279.

It is an arithmetic number, because the mean of its divisors is an integer number (1344402279).

Almost surely, 2^2688804557 is an apocalyptic number.

It is an amenable number.

2688804557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2688804557 is an equidigital number, since it uses as much as digits as its factorization.

2688804557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4300800, while the sum is 53.

The square root of 2688804557 is about 51853.6841217671. The cubic root of 2688804557 is about 1390.5493674084.

The spelling of 2688804557 in words is "two billion, six hundred eighty-eight million, eight hundred four thousand, five hundred fifty-seven".