851009351685 has 16 divisors (see below), whose sum is σ = 1420815613824. Its totient is φ = 434138103872.

The previous prime is 851009351641. The next prime is 851009351707. The reversal of 851009351685 is 586153900158.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 851009351685 - 2¹⁰ = 851009350661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1233346542 + ... + 1233347231.

It is an arithmetic number, because the mean of its divisors is an integer number (88800975864).

Almost surely, 2^851009351685 is an apocalyptic number.

It is an amenable number.

851009351685 is a deficient number, since it is larger than the sum of its proper divisors (569806262139).

851009351685 is a wasteful number, since it uses less digits than its factorization.

851009351685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466693804.

The product of its (nonzero) digits is 1296000, while the sum is 51.

The spelling of 851009351685 in words is "eight hundred fifty-one billion, nine million, three hundred fifty-one thousand, six hundred eighty-five".