851039644425 has 48 divisors (see below), whose sum is σ = 1421663591040. Its totient is φ = 449198231040.

The previous prime is 851039644381. The next prime is 851039644439. The reversal of 851039644425 is 524446930158.

It is a happy number.

It is not a de Polignac number, because 851039644425 - 2¹¹ = 851039642377 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2719869 + ... + 3016581.

It is an arithmetic number, because the mean of its divisors is an integer number (29617991480).

Almost surely, 2^851039644425 is an apocalyptic number.

It is an amenable number.

851039644425 is a deficient number, since it is larger than the sum of its proper divisors (570623946615).

851039644425 is a wasteful number, since it uses less digits than its factorization.

851039644425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297122 (or 297117 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 851039644425 in words is "eight hundred fifty-one billion, thirty-nine million, six hundred forty-four thousand, four hundred twenty-five".