285856406789 has 2 divisors, whose sum is σ = 285856406790. Its totient is φ = 285856406788.

The previous prime is 285856406749. The next prime is 285856406839. The reversal of 285856406789 is 987604658582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285307676164 + 548730625 = 534142^2 + 23425^2 .

It is a cyclic number.

It is not a de Polignac number, because 285856406789 - 2¹² = 285856402693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285856406749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142928203394 + 142928203395.

It is an arithmetic number, because the mean of its divisors is an integer number (142928203395).

Almost surely, 2^285856406789 is an apocalyptic number.

It is an amenable number.

285856406789 is a deficient number, since it is larger than the sum of its proper divisors (1).

285856406789 is an equidigital number, since it uses as much as digits as its factorization.

285856406789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 232243200, while the sum is 68.

The spelling of 285856406789 in words is "two hundred eighty-five billion, eight hundred fifty-six million, four hundred six thousand, seven hundred eighty-nine".