851860663 has 2 divisors, whose sum is σ = 851860664. Its totient is φ = 851860662.

The previous prime is 851860651. The next prime is 851860673. The reversal of 851860663 is 366068158.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851860663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851860673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425930331 + 425930332.

It is an arithmetic number, because the mean of its divisors is an integer number (425930332).

Almost surely, 2^851860663 is an apocalyptic number.

851860663 is a deficient number, since it is larger than the sum of its proper divisors (1).

851860663 is an equidigital number, since it uses as much as digits as its factorization.

851860663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 851860663 is about 29186.6521375782. The cubic root of 851860663 is about 947.9589283392.

The spelling of 851860663 in words is "eight hundred fifty-one million, eight hundred sixty thousand, six hundred sixty-three".