66614445565 has 4 divisors (see below), whose sum is σ = 79937334684. Its totient is φ = 53291556448.

The previous prime is 66614445533. The next prime is 66614445629. The reversal of 66614445565 is 56554441666.

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 44445915684 + 22168529881 = 210822^2 + 148891^2 .

It is a cyclic number.

It is not a de Polignac number, because 66614445565 - 2⁵ = 66614445533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6661444552 + ... + 6661444561.

It is an arithmetic number, because the mean of its divisors is an integer number (19984333671).

Almost surely, 2^66614445565 is an apocalyptic number.

It is an amenable number.

66614445565 is a deficient number, since it is larger than the sum of its proper divisors (13322889119).

66614445565 is a wasteful number, since it uses less digits than its factorization.

66614445565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322889118.

The product of its digits is 10368000, while the sum is 52.

The spelling of 66614445565 in words is "sixty-six billion, six hundred fourteen million, four hundred forty-five thousand, five hundred sixty-five".