851783021087 has 2 divisors, whose sum is σ = 851783021088. Its totient is φ = 851783021086.

The previous prime is 851783021083. The next prime is 851783021153. The reversal of 851783021087 is 780120387158.

851783021087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851783021087 - 2² = 851783021083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851783021083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425891510543 + 425891510544.

It is an arithmetic number, because the mean of its divisors is an integer number (425891510544).

Almost surely, 2^851783021087 is an apocalyptic number.

851783021087 is a deficient number, since it is larger than the sum of its proper divisors (1).

851783021087 is an equidigital number, since it uses as much as digits as its factorization.

851783021087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 851783021087 in words is "eight hundred fifty-one billion, seven hundred eighty-three million, twenty-one thousand, eighty-seven".