855561210 has 128 divisors (see below), whose sum is σ = 2538086400. Its totient is φ = 180102144.

The previous prime is 855561209. The next prime is 855561211. The reversal of 855561210 is 12165558.

It is an interprime number because it is at equal distance from previous prime (855561209) and next prime (855561211).

It is not an unprimeable number, because it can be changed into a prime (855561211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165241 + ... + 170339.

It is an arithmetic number, because the mean of its divisors is an integer number (19828800).

Almost surely, 2^855561210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855561210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269043200).

855561210 is an abundant number, since it is smaller than the sum of its proper divisors (1682525190).

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

855561210 is a wasteful number, since it uses less digits than its factorization.

855561210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 855561210 is about 29249.9779487096. The cubic root of 855561210 is about 949.3296138360.

The spelling of 855561210 in words is "eight hundred fifty-five million, five hundred sixty-one thousand, two hundred ten".