51661703611 has 16 divisors (see below), whose sum is σ = 59427613440. Its totient is φ = 43993046880.

The previous prime is 51661703573. The next prime is 51661703647. The reversal of 51661703611 is 11630716615.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51661703611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51661703911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714096 + ... + 783106.

It is an arithmetic number, because the mean of its divisors is an integer number (3714225840).

Almost surely, 2^51661703611 is an apocalyptic number.

51661703611 is a deficient number, since it is larger than the sum of its proper divisors (7765909829).

51661703611 is a wasteful number, since it uses less digits than its factorization.

51661703611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69714.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 51661703611 in words is "fifty-one billion, six hundred sixty-one million, seven hundred three thousand, six hundred eleven".