66503678 has 4 divisors (see below), whose sum is σ = 99755520. Its totient is φ = 33251838.

The previous prime is 66503669. The next prime is 66503687. The reversal of 66503678 is 87630566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87630566 = 2 ⋅43815283.

It is an interprime number because it is at equal distance from previous prime (66503669) and next prime (66503687).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16625918 + ... + 16625921.

It is an arithmetic number, because the mean of its divisors is an integer number (24938880).

Almost surely, 2^66503678 is an apocalyptic number.

66503678 is a deficient number, since it is larger than the sum of its proper divisors (33251842).

66503678 is a wasteful number, since it uses less digits than its factorization.

66503678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33251841.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66503678 is about 8154.9787246810. The cubic root of 66503678 is about 405.1494200481.

The spelling of 66503678 in words is "sixty-six million, five hundred three thousand, six hundred seventy-eight".