66500390 has 24 divisors (see below), whose sum is σ = 131574240. Its totient is φ = 24181520.

The previous prime is 66500389. The next prime is 66500407. The reversal of 66500390 is 9300566.

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 in 11 ways as a sum of consecutive naturals, for example, 26270 + ... + 28689.

It is an arithmetic number, because the mean of its divisors is an integer number (5482260).

Almost surely, 2^66500390 is an apocalyptic number.

66500390 is a deficient number, since it is larger than the sum of its proper divisors (65073850).

66500390 is a wasteful number, since it uses less digits than its factorization.

66500390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54988 (or 54977 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 66500390 is about 8154.7771275492. Note that the first 3 decimals coincide. The cubic root of 66500390 is about 405.1427429575.

The spelling of 66500390 in words is "sixty-six million, five hundred thousand, three hundred ninety".