51565656105 has 16 divisors (see below), whose sum is σ = 91672277760. Its totient is φ = 27501683184.

The previous prime is 51565656067. The next prime is 51565656133. The reversal of 51565656105 is 50165656515.

51565656105 is a `hidden beast` number, since 515 + 65 + 65 + 6 + 10 + 5 = 666.

It is not a de Polignac number, because 51565656105 - 2⁶ = 51565656041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon 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, 190983777 + ... + 190984046.

It is an arithmetic number, because the mean of its divisors is an integer number (5729517360).

Almost surely, 2^51565656105 is an apocalyptic number.

It is an amenable number.

51565656105 is a deficient number, since it is larger than the sum of its proper divisors (40106621655).

51565656105 is a wasteful number, since it uses less digits than its factorization.

51565656105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381967837 (or 381967831 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 51565656105 in words is "fifty-one billion, five hundred sixty-five million, six hundred fifty-six thousand, one hundred five".