66604093 has 4 divisors (see below), whose sum is σ = 67860828. Its totient is φ = 65347360.

The previous prime is 66604081. The next prime is 66604103. The reversal of 66604093 is 39040666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57350329 + 9253764 = 7573^2 + 3042^2 .

It is a cyclic number.

It is not a de Polignac number, because 66604093 - 2⁵ = 66604061 is a prime.

It is a super-2 number, since 2×66604093² = 8872210408705298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604003) 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, 628288 + ... + 628393.

It is an arithmetic number, because the mean of its divisors is an integer number (16965207).

Almost surely, 2^66604093 is an apocalyptic number.

It is an amenable number.

66604093 is a deficient number, since it is larger than the sum of its proper divisors (1256735).

66604093 is a wasteful number, since it uses less digits than its factorization.

66604093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256734.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 66604093 is about 8161.1330708426. The cubic root of 66604093 is about 405.3532314330.

The spelling of 66604093 in words is "sixty-six million, six hundred four thousand, ninety-three".