665516651066 has 16 divisors (see below), whose sum is σ = 1057027885056. Its totient is φ = 313175165376.

The previous prime is 665516651039. The next prime is 665516651099. The reversal of 665516651066 is 660156615566.

It is a happy number.

It is a super-2 number, since 2×665516651066² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665516650999 and 665516651017.

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, 977285 + ... + 1511991.

It is an arithmetic number, because the mean of its divisors is an integer number (66064242816).

Almost surely, 2^665516651066 is an apocalyptic number.

665516651066 is a deficient number, since it is larger than the sum of its proper divisors (391511233990).

665516651066 is a wasteful number, since it uses less digits than its factorization.

665516651066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571333.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 665516651066 in words is "six hundred sixty-five billion, five hundred sixteen million, six hundred fifty-one thousand, sixty-six".