855940903686 has 144 divisors (see below), whose sum is σ = 2059943768064. Its totient is φ = 256648260000.

The previous prime is 855940903681. The next prime is 855940903703. The reversal of 855940903686 is 686309049558.

855940903686 is a `hidden beast` number, since 8 + 5 + 594 + 0 + 9 + 0 + 36 + 8 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855940903681) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 268234351 + ... + 268237541.

It is an arithmetic number, because the mean of its divisors is an integer number (14305165056).

Almost surely, 2^855940903686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855940903686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1029971884032).

855940903686 is an abundant number, since it is smaller than the sum of its proper divisors (1204002864378).

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

855940903686 is a wasteful number, since it uses less digits than its factorization.

855940903686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4479 (or 4465 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 855940903686 in words is "eight hundred fifty-five billion, nine hundred forty million, nine hundred three thousand, six hundred eighty-six".