665500005565 has 32 divisors (see below), whose sum is σ = 836187052032. Its totient is φ = 507838464000.

The previous prime is 665500005559. The next prime is 665500005571. The reversal of 665500005565 is 565500005566.

It is an interprime number because it is at equal distance from previous prime (665500005559) and next prime (665500005571).

It is not a de Polignac number, because 665500005565 - 2³ = 665500005557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84525469 + ... + 84533341.

It is an arithmetic number, because the mean of its divisors is an integer number (26130845376).

Almost surely, 2^665500005565 is an apocalyptic number.

It is an amenable number.

665500005565 is a deficient number, since it is larger than the sum of its proper divisors (170687046467).

665500005565 is a wasteful number, since it uses less digits than its factorization.

665500005565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15661.

The product of its (nonzero) digits is 675000, while the sum is 43.

Subtracting from 665500005565 its reverse (565500005566), we obtain a palindrome (99999999999).

The spelling of 665500005565 in words is "six hundred sixty-five billion, five hundred million, five thousand, five hundred sixty-five".