2685498820891 has 2 divisors, whose sum is σ = 2685498820892. Its totient is φ = 2685498820890.

The previous prime is 2685498820843. The next prime is 2685498820957. The reversal of 2685498820891 is 1980288945862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2685498820891 - 2³³ = 2676908886299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2685498820891.

It is not a weakly prime, because it can be changed into another prime (2685498220891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342749410445 + 1342749410446.

It is an arithmetic number, because the mean of its divisors is an integer number (1342749410446).

Almost surely, 2^{2685498820891} is an apocalyptic number.

2685498820891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685498820891 is an equidigital number, since it uses as much as digits as its factorization.

2685498820891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 159252480, while the sum is 70.

The spelling of 2685498820891 in words is "two trillion, six hundred eighty-five billion, four hundred ninety-eight million, eight hundred twenty thousand, eight hundred ninety-one".