851636845 has 16 divisors (see below), whose sum is σ = 1084285440. Its totient is φ = 639925504.

The previous prime is 851636839. The next prime is 851636897. The reversal of 851636845 is 548636158.

It is a cyclic number.

It is not a de Polignac number, because 851636845 - 2³ = 851636837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 851636795 and 851636804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32796 + ... + 52714.

It is an arithmetic number, because the mean of its divisors is an integer number (67767840).

Almost surely, 2^851636845 is an apocalyptic number.

851636845 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

851636845 is a deficient number, since it is larger than the sum of its proper divisors (232648595).

851636845 is a wasteful number, since it uses less digits than its factorization.

851636845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20444.

The product of its digits is 691200, while the sum is 46.

The square root of 851636845 is about 29182.8176329840. The cubic root of 851636845 is about 947.8758987761.

The spelling of 851636845 in words is "eight hundred fifty-one million, six hundred thirty-six thousand, eight hundred forty-five".