65855856 has 80 divisors (see below), whose sum is σ = 190666368. Its totient is φ = 19411200.

The previous prime is 65855851. The next prime is 65855861.

65855856 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (65855851) and next prime (65855861).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65855851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17851 + ... + 21221.

Almost surely, 2^65855856 is an apocalyptic number.

65855856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65855856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95333184).

65855856 is an abundant number, since it is smaller than the sum of its proper divisors (124810512).

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

65855856 is a wasteful number, since it uses less digits than its factorization.

65855856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430 (or 3424 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 48.

The square root of 65855856 is about 8115.1621055898. The cubic root of 65855856 is about 403.8295853492.

The spelling of 65855856 in words is "sixty-five million, eight hundred fifty-five thousand, eight hundred fifty-six".