855837516440 has 64 divisors (see below), whose sum is σ = 2040200848800. Its totient is φ = 321993197568.

The previous prime is 855837516421. The next prime is 855837516487. The reversal of 855837516440 is 44615738558.

It is a super-3 number, since 3×855837516440³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675182 + ... + 1472258.

Almost surely, 2^855837516440 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 855837516440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020100424400).

855837516440 is an abundant number, since it is smaller than the sum of its proper divisors (1184363332360).

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

855837516440 is a wasteful number, since it uses less digits than its factorization.

855837516440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798684 (or 798680 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 855837516440 in words is "eight hundred fifty-five billion, eight hundred thirty-seven million, five hundred sixteen thousand, four hundred forty".