3985966851 has 16 divisors (see below), whose sum is σ = 5661747840. Its totient is φ = 2487119040.

The previous prime is 3985966841. The next prime is 3985966903. The reversal of 3985966851 is 1586695893.

It is not a de Polignac number, because 3985966851 - 2⁵ = 3985966819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3985966801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416530 + ... + 425991.

It is an arithmetic number, because the mean of its divisors is an integer number (353859240).

Almost surely, 2^3985966851 is an apocalyptic number.

3985966851 is a deficient number, since it is larger than the sum of its proper divisors (1675780989).

3985966851 is a wasteful number, since it uses less digits than its factorization.

3985966851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842626.

The product of its digits is 13996800, while the sum is 60.

The square root of 3985966851 is about 63134.5139444345. The cubic root of 3985966851 is about 1585.5425238969.

The spelling of 3985966851 in words is "three billion, nine hundred eighty-five million, nine hundred sixty-six thousand, eight hundred fifty-one".