855611955 has 72 divisors (see below), whose sum is σ = 1718939664. Its totient is φ = 390374400.

The previous prime is 855611941. The next prime is 855611987. The reversal of 855611955 is 559116558.

855611955 is a `hidden beast` number, since 8 + 556 + 1 + 1 + 95 + 5 = 666.

It is not a de Polignac number, because 855611955 - 2¹¹ = 855609907 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 855611955.

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 71 ways as a sum of consecutive naturals, for example, 140065 + ... + 146045.

It is an arithmetic number, because the mean of its divisors is an integer number (23874162).

Almost surely, 2^855611955 is an apocalyptic number.

855611955 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

855611955 is an abundant number, since it is smaller than the sum of its proper divisors (863327709).

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

855611955 is a wasteful number, since it uses less digits than its factorization.

855611955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6037 (or 6017 counting only the distinct ones).

The product of its digits is 270000, while the sum is 45.

The square root of 855611955 is about 29250.8453723991. The cubic root of 855611955 is about 949.3483823271.

The spelling of 855611955 in words is "eight hundred fifty-five million, six hundred eleven thousand, nine hundred fifty-five".