66919648 has 12 divisors (see below), whose sum is σ = 131748120. Its totient is φ = 33459808.

The previous prime is 66919631. The next prime is 66919649. The reversal of 66919648 is 84691966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045588 + ... + 1045651.

It is an arithmetic number, because the mean of its divisors is an integer number (10979010).

Almost surely, 2^66919648 is an apocalyptic number.

It is an amenable number.

66919648 is a deficient number, since it is larger than the sum of its proper divisors (64828472).

66919648 is a wasteful number, since it uses less digits than its factorization.

66919648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091249 (or 2091241 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 66919648 is about 8180.4430197881. The cubic root of 66919648 is about 405.9923801623.

The spelling of 66919648 in words is "sixty-six million, nine hundred nineteen thousand, six hundred forty-eight".