6905405861 has 2 divisors, whose sum is σ = 6905405862. Its totient is φ = 6905405860.

The previous prime is 6905405813. The next prime is 6905405887. The reversal of 6905405861 is 1685045096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6673909636 + 231496225 = 81694^2 + 15215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6905405861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6905405891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3452702930 + 3452702931.

It is an arithmetic number, because the mean of its divisors is an integer number (3452702931).

Almost surely, 2^6905405861 is an apocalyptic number.

It is an amenable number.

6905405861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6905405861 is an equidigital number, since it uses as much as digits as its factorization.

6905405861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 6905405861 is about 83098.7717177577. The cubic root of 6905405861 is about 1904.2753090241.

The spelling of 6905405861 in words is "six billion, nine hundred five million, four hundred five thousand, eight hundred sixty-one".