66610005 has 64 divisors (see below), whose sum is σ = 134424576. Its totient is φ = 27360000.

The previous prime is 66609989. The next prime is 66610021. The reversal of 66610005 is 50001666.

It is an interprime number because it is at equal distance from previous prime (66609989) and next prime (66610021).

It is not a de Polignac number, because 66610005 - 2⁴ = 66609989 is a prime.

It is a super-2 number, since 2×66610005² = 8873785532200050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116370 + ... + 116940.

It is an arithmetic number, because the mean of its divisors is an integer number (2100384).

Almost surely, 2^66610005 is an apocalyptic number.

It is an amenable number.

66610005 is an abundant number, since it is smaller than the sum of its proper divisors (67814571).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66610005 is a wasteful number, since it uses less digits than its factorization.

66610005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 66610005 is about 8161.4952674127. The cubic root of 66610005 is about 405.3652245769.

The spelling of 66610005 in words is "sixty-six million, six hundred ten thousand, five".