66420471 has 8 divisors (see below), whose sum is σ = 95373040. Its totient is φ = 40874112.

The previous prime is 66420467. The next prime is 66420491. The reversal of 66420471 is 17402466.

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

It is not a de Polignac number, because 66420471 - 2² = 66420467 is a prime.

It is a super-3 number, since 3×66420471³ (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 (66420421) 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, 851506 + ... + 851583.

It is an arithmetic number, because the mean of its divisors is an integer number (11921630).

Almost surely, 2^66420471 is an apocalyptic number.

66420471 is a deficient number, since it is larger than the sum of its proper divisors (28952569).

66420471 is a wasteful number, since it uses less digits than its factorization.

66420471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703105.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 66420471 is about 8149.8755205218. The cubic root of 66420471 is about 404.9803800890.

The spelling of 66420471 in words is "sixty-six million, four hundred twenty thousand, four hundred seventy-one".