66604147 has 8 divisors (see below), whose sum is σ = 71222112. Its totient is φ = 62064000.

The previous prime is 66604127. The next prime is 66604163. The reversal of 66604147 is 74140666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66604147 - 2⁷ = 66604019 is a prime.

It is a super-2 number, since 2×66604147² = 8872224795195218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66604117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17679 + ... + 21112.

It is an arithmetic number, because the mean of its divisors is an integer number (8902764).

Almost surely, 2^66604147 is an apocalyptic number.

66604147 is a deficient number, since it is larger than the sum of its proper divisors (4617965).

66604147 is a wasteful number, since it uses less digits than its factorization.

66604147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38909.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 66604147 is about 8161.1363792060. The cubic root of 66604147 is about 405.3533409812.

The spelling of 66604147 in words is "sixty-six million, six hundred four thousand, one hundred forty-seven".