66231005 has 4 divisors (see below), whose sum is σ = 79477212. Its totient is φ = 52984800.

The previous prime is 66230971. The next prime is 66231019. The reversal of 66231005 is 50013266.

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 10310521 + 55920484 = 3211^2 + 7478^2 .

It is not a de Polignac number, because 66231005 - 2²² = 62036701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6623096 + ... + 6623105.

It is an arithmetic number, because the mean of its divisors is an integer number (19869303).

Almost surely, 2^66231005 is an apocalyptic number.

It is an amenable number.

66231005 is a deficient number, since it is larger than the sum of its proper divisors (13246207).

66231005 is a wasteful number, since it uses less digits than its factorization.

66231005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13246206.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 66231005 is about 8138.2433608243. The cubic root of 66231005 is about 404.5949412554.

The spelling of 66231005 in words is "sixty-six million, two hundred thirty-one thousand, five".