2685128893 has 2 divisors, whose sum is σ = 2685128894. Its totient is φ = 2685128892.

The previous prime is 2685128857. The next prime is 2685128899. The reversal of 2685128893 is 3988215862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1840238404 + 844890489 = 42898^2 + 29067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2685128893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2685128893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685128899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342564446 + 1342564447.

It is an arithmetic number, because the mean of its divisors is an integer number (1342564447).

Almost surely, 2^2685128893 is an apocalyptic number.

It is an amenable number.

2685128893 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685128893 is an equidigital number, since it uses as much as digits as its factorization.

2685128893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 52.

The square root of 2685128893 is about 51818.2293502972. The cubic root of 2685128893 is about 1389.9154397087.

The spelling of 2685128893 in words is "two billion, six hundred eighty-five million, one hundred twenty-eight thousand, eight hundred ninety-three".