6897904779061 has 2 divisors, whose sum is σ = 6897904779062. Its totient is φ = 6897904779060.

The previous prime is 6897904779049. The next prime is 6897904779079. The reversal of 6897904779061 is 1609774097986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6893092720900 + 4812058161 = 2625470^2 + 69369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6897904779061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6897904779011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3448952389530 + 3448952389531.

It is an arithmetic number, because the mean of its divisors is an integer number (3448952389531).

Almost surely, 2^{6897904779061} is an apocalyptic number.

It is an amenable number.

6897904779061 is a deficient number, since it is larger than the sum of its proper divisors (1).

6897904779061 is an equidigital number, since it uses as much as digits as its factorization.

6897904779061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288054144, while the sum is 73.

The spelling of 6897904779061 in words is "six trillion, eight hundred ninety-seven billion, nine hundred four million, seven hundred seventy-nine thousand, sixty-one".