66839471 has 8 divisors (see below), whose sum is σ = 69437088. Its totient is φ = 64288000.

The previous prime is 66839467. The next prime is 66839483. The reversal of 66839471 is 17493866.

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

It is not a de Polignac number, because 66839471 - 2² = 66839467 is a prime.

It is a super-3 number, since 3×66839471³ (a number of 24 digits) contains 333 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 (66839411) 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, 8570 + ... + 14391.

It is an arithmetic number, because the mean of its divisors is an integer number (8679636).

Almost surely, 2^66839471 is an apocalyptic number.

66839471 is a deficient number, since it is larger than the sum of its proper divisors (2597617).

66839471 is a wasteful number, since it uses less digits than its factorization.

66839471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23073.

The product of its digits is 217728, while the sum is 44.

The square root of 66839471 is about 8175.5410218529. The cubic root of 66839471 is about 405.8301743892.

The spelling of 66839471 in words is "sixty-six million, eight hundred thirty-nine thousand, four hundred seventy-one".