66749471 has 2 divisors, whose sum is σ = 66749472. Its totient is φ = 66749470.

The previous prime is 66749461. The next prime is 66749477. The reversal of 66749471 is 17494766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66749471 - 2¹⁰ = 66748447 is a prime.

It is a super-3 number, since 3×66749471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66749477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33374735 + 33374736.

It is an arithmetic number, because the mean of its divisors is an integer number (33374736).

Almost surely, 2^66749471 is an apocalyptic number.

66749471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66749471 is an equidigital number, since it uses as much as digits as its factorization.

66749471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 66749471 is about 8170.0349448457. The cubic root of 66749471 is about 405.6479411417.

The spelling of 66749471 in words is "sixty-six million, seven hundred forty-nine thousand, four hundred seventy-one".