6400400959 has 2 divisors, whose sum is σ = 6400400960. Its totient is φ = 6400400958.

The previous prime is 6400400953. The next prime is 6400400977. The reversal of 6400400959 is 9590040046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400400959 - 2⁵ = 6400400927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400400953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200200479 + 3200200480.

It is an arithmetic number, because the mean of its divisors is an integer number (3200200480).

Almost surely, 2^6400400959 is an apocalyptic number.

6400400959 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400400959 is an equidigital number, since it uses as much as digits as its factorization.

6400400959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6400400959 is about 80002.5059545012. The cubic root of 6400400959 is about 1856.6743052775.

The spelling of 6400400959 in words is "six billion, four hundred million, four hundred thousand, nine hundred fifty-nine".