851016420672 has 112 divisors (see below), whose sum is σ = 2457440197632. Its totient is φ = 257768558080.

The previous prime is 851016420649. The next prime is 851016420673. The reversal of 851016420672 is 276024610158.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851016420673) 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, 4699033 + ... + 4876775.

It is an arithmetic number, because the mean of its divisors is an integer number (21941430336).

Almost surely, 2^851016420672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851016420672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1228720098816).

851016420672 is an abundant number, since it is smaller than the sum of its proper divisors (1606423776960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851016420672 is a wasteful number, since it uses less digits than its factorization.

851016420672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180036 (or 180026 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 851016420672 in words is "eight hundred fifty-one billion, sixteen million, four hundred twenty thousand, six hundred seventy-two".