665465564566 has 32 divisors (see below), whose sum is σ = 1125300439296. Its totient is φ = 292524540000.

The previous prime is 665465564551. The next prime is 665465564573.

665465564566 is nontrivially palindromic in base 10.

It is a super-4 number, since 4×665465564566⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 665465564498 and 665465564507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3386890 + ... + 3577981.

It is an arithmetic number, because the mean of its divisors is an integer number (35165638728).

Almost surely, 2^665465564566 is an apocalyptic number.

665465564566 is a deficient number, since it is larger than the sum of its proper divisors (459834874730).

665465564566 is a wasteful number, since it uses less digits than its factorization.

665465564566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6965028.

The product of its digits is 466560000, while the sum is 64.

The spelling of 665465564566 in words is "six hundred sixty-five billion, four hundred sixty-five million, five hundred sixty-four thousand, five hundred sixty-six".