201556855 has 4 divisors (see below), whose sum is σ = 241868232. Its totient is φ = 161245480.

The previous prime is 201556841. The next prime is 201556877. The reversal of 201556855 is 558655102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201556855 - 2⁹ = 201556343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20155681 + ... + 20155690.

It is an arithmetic number, because the mean of its divisors is an integer number (60467058).

Almost surely, 2^201556855 is an apocalyptic number.

201556855 is a deficient number, since it is larger than the sum of its proper divisors (40311377).

201556855 is an equidigital number, since it uses as much as digits as its factorization.

201556855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40311376.

The product of its (nonzero) digits is 60000, while the sum is 37.

The square root of 201556855 is about 14197.0720572941. The cubic root of 201556855 is about 586.3170511125.

The spelling of 201556855 in words is "two hundred one million, five hundred fifty-six thousand, eight hundred fifty-five".