855591660 has 480 divisors, whose sum is σ = 3532193280. Its totient is φ = 168428160.

The previous prime is 855591647. The next prime is 855591689. The reversal of 855591660 is 66195558.

It is a happy number.

855591660 is a `hidden beast` number, since 8 + 55 + 591 + 6 + 6 + 0 = 666.

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

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 159 ways as a sum of consecutive naturals, for example, 45031131 + ... + 45031149.

It is an arithmetic number, because the mean of its divisors is an integer number (7358736).

Almost surely, 2^855591660 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 855591660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1766096640).

855591660 is an abundant number, since it is smaller than the sum of its proper divisors (2676601620).

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

855591660 is a wasteful number, since it uses less digits than its factorization.

855591660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 855591660 is about 29250.4984572913. The cubic root of 855591660 is about 949.3408761293.

The spelling of 855591660 in words is "eight hundred fifty-five million, five hundred ninety-one thousand, six hundred sixty".