65871855 has 48 divisors (see below), whose sum is σ = 138176064. Its totient is φ = 28339200.

The previous prime is 65871851. The next prime is 65871893. The reversal of 65871855 is 55817856.

65871855 is a `hidden beast` number, since 6 + 587 + 18 + 55 = 666.

It is not a de Polignac number, because 65871855 - 2² = 65871851 is a prime.

It is a super-2 number, since 2×65871855² = 8678202562282050, which contains 22 as substring.

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 65871855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65871851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 796 + ... + 11505.

It is an arithmetic number, because the mean of its divisors is an integer number (2878668).

Almost surely, 2^65871855 is an apocalyptic number.

65871855 is an abundant number, since it is smaller than the sum of its proper divisors (72304209).

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

65871855 is a wasteful number, since it uses less digits than its factorization.

65871855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12336 (or 12333 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 65871855 is about 8116.1477931344. The cubic root of 65871855 is about 403.8622847769.

The spelling of 65871855 in words is "sixty-five million, eight hundred seventy-one thousand, eight hundred fifty-five".