665494545494566 has 32 divisors (see below), whose sum is σ = 1031875191290880. Its totient is φ = 321725246015616.

The previous prime is 665494545494533. The next prime is 665494545494599.

665494545494566 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (665494545494533) and next prime (665494545494599).

It is a self number, because there is not a number n which added to its sum of digits gives 665494545494566.

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, 88541955 + ... + 95763598.

It is an arithmetic number, because the mean of its divisors is an integer number (32246099727840).

Almost surely, 2^{665494545494566} is an apocalyptic number.

665494545494566 is a deficient number, since it is larger than the sum of its proper divisors (366380645796314).

665494545494566 is a wasteful number, since it uses less digits than its factorization.

665494545494566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184306068.

The product of its digits is 67184640000, while the sum is 82.

The spelling of 665494545494566 in words is "six hundred sixty-five trillion, four hundred ninety-four billion, five hundred forty-five million, four hundred ninety-four thousand, five hundred sixty-six".