66444425105 has 8 divisors (see below), whose sum is σ = 79737792552. Its totient is φ = 53152551808.

The previous prime is 66444425087. The next prime is 66444425119. The reversal of 66444425105 is 50152444466.

It can be written as a sum of positive squares in 4 ways, for example, as 5340540241 + 61103884864 = 73079^2 + 247192^2 .

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 66444425105 - 2³² = 62149457809 is a prime.

It is a super-2 number, since 2×66444425105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273254 + ... + 455583.

It is an arithmetic number, because the mean of its divisors is an integer number (9967224069).

Almost surely, 2^66444425105 is an apocalyptic number.

It is an amenable number.

66444425105 is a deficient number, since it is larger than the sum of its proper divisors (13293367447).

66444425105 is a wasteful number, since it uses less digits than its factorization.

66444425105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747075.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 66444425105 in words is "sixty-six billion, four hundred forty-four million, four hundred twenty-five thousand, one hundred five".