66904471 has 2 divisors, whose sum is σ = 66904472. Its totient is φ = 66904470.

The previous prime is 66904459. The next prime is 66904477. The reversal of 66904471 is 17440966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66904471 - 2¹³ = 66896279 is a prime.

It is a super-3 number, since 3×66904471³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66904471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66904477) 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, 33452235 + 33452236.

It is an arithmetic number, because the mean of its divisors is an integer number (33452236).

Almost surely, 2^66904471 is an apocalyptic number.

66904471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66904471 is an equidigital number, since it uses as much as digits as its factorization.

66904471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66904471 is about 8179.5153279397. The cubic root of 66904471 is about 405.9616855785.

The spelling of 66904471 in words is "sixty-six million, nine hundred four thousand, four hundred seventy-one".