63855871 has 4 divisors (see below), whose sum is σ = 63882000. Its totient is φ = 63829744.

The previous prime is 63855839. The next prime is 63855907. The reversal of 63855871 is 17855836.

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

It is a cyclic number.

It is not a de Polignac number, because 63855871 - 2⁵ = 63855839 is a prime.

It is a super-2 number, since 2×63855871² = 8155144522337282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63855811) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8971 + ... + 14428.

It is an arithmetic number, because the mean of its divisors is an integer number (15970500).

Almost surely, 2^63855871 is an apocalyptic number.

63855871 is a deficient number, since it is larger than the sum of its proper divisors (26129).

63855871 is a wasteful number, since it uses less digits than its factorization.

63855871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26128.

The product of its digits is 201600, while the sum is 43.

The square root of 63855871 is about 7990.9868602069. The cubic root of 63855871 is about 399.6995055643.

The spelling of 63855871 in words is "sixty-three million, eight hundred fifty-five thousand, eight hundred seventy-one".