2686388561 has 2 divisors, whose sum is σ = 2686388562. Its totient is φ = 2686388560.

The previous prime is 2686388557. The next prime is 2686388563. The reversal of 2686388561 is 1658836862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2233507600 + 452880961 = 47260^2 + 21281^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686388561 - 2² = 2686388557 is a prime.

Together with 2686388563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2686388563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343194280 + 1343194281.

It is an arithmetic number, because the mean of its divisors is an integer number (1343194281).

Almost surely, 2^2686388561 is an apocalyptic number.

It is an amenable number.

2686388561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686388561 is an equidigital number, since it uses as much as digits as its factorization.

2686388561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 53.

The square root of 2686388561 is about 51830.3826051863. The cubic root of 2686388561 is about 1390.1327549482.

The spelling of 2686388561 in words is "two billion, six hundred eighty-six million, three hundred eighty-eight thousand, five hundred sixty-one".