851805410940 has 432 divisors, whose sum is σ = 2891706854400. Its totient is φ = 202777344000.

The previous prime is 851805410903. The next prime is 851805410947. The reversal of 851805410940 is 49014508158.

It is a happy number.

851805410940 is a `hidden beast` number, since 8 + 5 + 18 + 0 + 541 + 0 + 94 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851805410947) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 279370536 + ... + 279373584.

Almost surely, 2^851805410940 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 851805410940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445853427200).

851805410940 is an abundant number, since it is smaller than the sum of its proper divisors (2039901443460).

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

851805410940 is a wasteful number, since it uses less digits than its factorization.

851805410940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314 (or 3298 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 851805410940 in words is "eight hundred fifty-one billion, eight hundred five million, four hundred ten thousand, nine hundred forty".