89789784857 has 2 divisors, whose sum is σ = 89789784858. Its totient is φ = 89789784856.

The previous prime is 89789784853. The next prime is 89789784913. The reversal of 89789784857 is 75848798798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86442468121 + 3347316736 = 294011^2 + 57856^2 .

It is a cyclic number.

It is not a de Polignac number, because 89789784857 - 2² = 89789784853 is a prime.

It is not a weakly prime, because it can be changed into another prime (89789784853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44894892428 + 44894892429.

It is an arithmetic number, because the mean of its divisors is an integer number (44894892429).

Almost surely, 2^89789784857 is an apocalyptic number.

It is an amenable number.

89789784857 is a deficient number, since it is larger than the sum of its proper divisors (1).

89789784857 is an equidigital number, since it uses as much as digits as its factorization.

89789784857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2275983360, while the sum is 80.

The spelling of 89789784857 in words is "eighty-nine billion, seven hundred eighty-nine million, seven hundred eighty-four thousand, eight hundred fifty-seven".