66943471 has 8 divisors (see below), whose sum is σ = 78574880. Its totient is φ = 55829088.

The previous prime is 66943439. The next prime is 66943493. The reversal of 66943471 is 17434966.

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

It is not a de Polignac number, because 66943471 - 2⁵ = 66943439 is a prime.

It is a super-3 number, since 3×66943471³ (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 (66943411) 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, 128976 + ... + 129493.

It is an arithmetic number, because the mean of its divisors is an integer number (9821860).

Almost surely, 2^66943471 is an apocalyptic number.

66943471 is a deficient number, since it is larger than the sum of its proper divisors (11631409).

66943471 is a wasteful number, since it uses less digits than its factorization.

66943471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258513.

The product of its digits is 108864, while the sum is 40.

The square root of 66943471 is about 8181.8989849545. The cubic root of 66943471 is about 406.0405514108.

The spelling of 66943471 in words is "sixty-six million, nine hundred forty-three thousand, four hundred seventy-one".