66965005 has 8 divisors (see below), whose sum is σ = 82530072. Its totient is φ = 52123968.

The previous prime is 66964993. The next prime is 66965011. The reversal of 66965005 is 50056966.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25220484 + 41744521 = 5022^2 + 6461^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66965005 - 2¹⁵ = 66932237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a plaindrome in base 11.

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 7 ways as a sum of consecutive naturals, for example, 180802 + ... + 181171.

It is an arithmetic number, because the mean of its divisors is an integer number (10316259).

Almost surely, 2^66965005 is an apocalyptic number.

It is an amenable number.

66965005 is a deficient number, since it is larger than the sum of its proper divisors (15565067).

66965005 is a wasteful number, since it uses less digits than its factorization.

66965005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362015.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 66965005 is about 8183.2148328148. The cubic root of 66965005 is about 406.0840843584.

The spelling of 66965005 in words is "sixty-six million, nine hundred sixty-five thousand, five".