651105506665 has 16 divisors (see below), whose sum is σ = 794754686016. Its totient is φ = 511945675200.

The previous prime is 651105506647. The next prime is 651105506687. The reversal of 651105506665 is 566605501156.

It is a de Polignac number, because none of the positive numbers 2^k-651105506665 is a prime.

It is a Duffinian 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, 440631 + ... + 1223260.

It is an arithmetic number, because the mean of its divisors is an integer number (49672167876).

Almost surely, 2^651105506665 is an apocalyptic number.

It is an amenable number.

651105506665 is a deficient number, since it is larger than the sum of its proper divisors (143649179351).

651105506665 is a wasteful number, since it uses less digits than its factorization.

651105506665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665240.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 651105506665 in words is "six hundred fifty-one billion, one hundred five million, five hundred six thousand, six hundred sixty-five".