66919408 has 10 divisors (see below), whose sum is σ = 129656384. Its totient is φ = 33459696.

The previous prime is 66919381. The next prime is 66919423. The reversal of 66919408 is 80491966.

It is a congruent number.

It is an unprimeable number.

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, 2091216 + ... + 2091247.

Almost surely, 2^66919408 is an apocalyptic number.

It is an amenable number.

66919408 is a deficient number, since it is larger than the sum of its proper divisors (62736976).

66919408 is a wasteful number, since it uses less digits than its factorization.

66919408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4182471 (or 4182465 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 66919408 is about 8180.4283506428. The cubic root of 66919408 is about 405.9918948126.

The spelling of 66919408 in words is "sixty-six million, nine hundred nineteen thousand, four hundred eight".