66855471 has 8 divisors (see below), whose sum is σ = 93832320. Its totient is φ = 42224472.

The previous prime is 66855463. The next prime is 66855473. The reversal of 66855471 is 17455866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66855471 - 2³ = 66855463 is a prime.

It is a super-3 number, since 3×66855471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66855473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586395 + ... + 586508.

It is an arithmetic number, because the mean of its divisors is an integer number (11729040).

Almost surely, 2^66855471 is an apocalyptic number.

66855471 is a deficient number, since it is larger than the sum of its proper divisors (26976849).

66855471 is a wasteful number, since it uses less digits than its factorization.

66855471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172925.

The product of its digits is 201600, while the sum is 42.

The square root of 66855471 is about 8176.5194918131. The cubic root of 66855471 is about 405.8625542822.

The spelling of 66855471 in words is "sixty-six million, eight hundred fifty-five thousand, four hundred seventy-one".