66601005 has 8 divisors (see below), whose sum is σ = 106561632. Its totient is φ = 35520528.

The previous prime is 66600991. The next prime is 66601009. The reversal of 66601005 is 50010666.

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

It is not a de Polignac number, because 66601005 - 2¹⁵ = 66568237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601009) 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, 2220019 + ... + 2220048.

It is an arithmetic number, because the mean of its divisors is an integer number (13320204).

Almost surely, 2^66601005 is an apocalyptic number.

It is an amenable number.

66601005 is a deficient number, since it is larger than the sum of its proper divisors (39960627).

66601005 is a wasteful number, since it uses less digits than its factorization.

66601005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440075.

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

The square root of 66601005 is about 8160.9438792336. The cubic root of 66601005 is about 405.3469668024.

The spelling of 66601005 in words is "sixty-six million, six hundred one thousand, five".