66604117 has 2 divisors, whose sum is σ = 66604118. Its totient is φ = 66604116.

The previous prime is 66604103. The next prime is 66604127. The reversal of 66604117 is 71140666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64416676 + 2187441 = 8026^2 + 1479^2 .

It is a cyclic number.

It is not a de Polignac number, because 66604117 - 2⁷ = 66603989 is a prime.

It is a super-2 number, since 2×66604117² = 8872216802699378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66604127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33302058 + 33302059.

It is an arithmetic number, because the mean of its divisors is an integer number (33302059).

Almost surely, 2^66604117 is an apocalyptic number.

It is an amenable number.

66604117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66604117 is an equidigital number, since it uses as much as digits as its factorization.

66604117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 66604117 is about 8161.1345412265. The cubic root of 66604117 is about 405.3532801211.

The spelling of 66604117 in words is "sixty-six million, six hundred four thousand, one hundred seventeen".