66877471 has 2 divisors, whose sum is σ = 66877472. Its totient is φ = 66877470.

The previous prime is 66877409. The next prime is 66877483. The reversal of 66877471 is 17477866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66877471 - 2¹¹ = 66875423 is a prime.

It is a super-3 number, since 3×66877471³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66872471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33438735 + 33438736.

It is an arithmetic number, because the mean of its divisors is an integer number (33438736).

Almost surely, 2^66877471 is an apocalyptic number.

66877471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66877471 is an equidigital number, since it uses as much as digits as its factorization.

66877471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 66877471 is about 8177.8646968509. The cubic root of 66877471 is about 405.9070682006.

The spelling of 66877471 in words is "sixty-six million, eight hundred seventy-seven thousand, four hundred seventy-one".