651105506666 has 16 divisors (see below), whose sum is σ = 980244248256. Its totient is φ = 324358781376.

The previous prime is 651105506647. The next prime is 651105506687. The reversal of 651105506666 is 666605501156.

It is a super-3 number, since 3×651105506666³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 651105506666.

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, 623315 + ... + 1300281.

It is an arithmetic number, because the mean of its divisors is an integer number (61265265516).

Almost surely, 2^651105506666 is an apocalyptic number.

651105506666 is a deficient number, since it is larger than the sum of its proper divisors (329138741590).

651105506666 is a wasteful number, since it uses less digits than its factorization.

651105506666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678733.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 651105506666 in words is "six hundred fifty-one billion, one hundred five million, five hundred six thousand, six hundred sixty-six".