66465577565 has 8 divisors (see below), whose sum is σ = 79762316760. Its totient is φ = 53170046272.

The previous prime is 66465577531. The next prime is 66465577579. The reversal of 66465577565 is 56577556466.

It can be written as a sum of positive squares in 4 ways, for example, as 2435323801 + 64030253764 = 49349^2 + 253042^2 .

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 66465577565 - 2⁸ = 66465577309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66465577498 and 66465577507.

It is a congruent 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, 176150 + ... + 404919.

It is an arithmetic number, because the mean of its divisors is an integer number (9970289595).

Almost surely, 2^66465577565 is an apocalyptic number.

It is an amenable number.

66465577565 is a deficient number, since it is larger than the sum of its proper divisors (13296739195).

66465577565 is a wasteful number, since it uses less digits than its factorization.

66465577565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603951.

The product of its digits is 158760000, while the sum is 62.

The spelling of 66465577565 in words is "sixty-six billion, four hundred sixty-five million, five hundred seventy-seven thousand, five hundred sixty-five".