66603986 has 8 divisors (see below), whose sum is σ = 100568064. Its totient is φ = 33081300.

The previous prime is 66603973. The next prime is 66603989. The reversal of 66603986 is 68930666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66603989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109970 + ... + 110573.

It is an arithmetic number, because the mean of its divisors is an integer number (12571008).

Almost surely, 2^66603986 is an apocalyptic number.

66603986 is a deficient number, since it is larger than the sum of its proper divisors (33964078).

66603986 is a wasteful number, since it uses less digits than its factorization.

66603986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220696.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66603986 is about 8161.1265153776. The cubic root of 66603986 is about 405.3530143652.

The spelling of 66603986 in words is "sixty-six million, six hundred three thousand, nine hundred eighty-six".