851663 has 8 divisors (see below), whose sum is σ = 892416. Its totient is φ = 811800.

The previous prime is 851659. The next prime is 851671. The reversal of 851663 is 366158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 851663 - 2² = 851659 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851663.

It is not an unprimeable number, because it can be changed into a prime (851603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2408 + ... + 2738.

It is an arithmetic number, because the mean of its divisors is an integer number (111552).

2⁸⁵¹⁶⁶³ is an apocalyptic number.

851663 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

851663 is a deficient number, since it is larger than the sum of its proper divisors (40753).

851663 is a wasteful number, since it uses less digits than its factorization.

851663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445.

The product of its digits is 4320, while the sum is 29.

The square root of 851663 is about 922.8558934091. The cubic root of 851663 is about 94.7885602224.

The spelling of 851663 in words is "eight hundred fifty-one thousand, six hundred sixty-three".