51061111105561 has 8 divisors (see below), whose sum is σ = 51291839781504. Its totient is φ = 50830433218320.

The previous prime is 51061111105519. The next prime is 51061111105621. The reversal of 51061111105561 is 16550111116015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51061111105561 - 2⁹ = 51061111105049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51061111105061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10681185 + ... + 14704078.

It is an arithmetic number, because the mean of its divisors is an integer number (6411479972688).

Almost surely, 2^{51061111105561} is an apocalyptic number.

It is an amenable number.

51061111105561 is a deficient number, since it is larger than the sum of its proper divisors (230728675943).

51061111105561 is a wasteful number, since it uses less digits than its factorization.

51061111105561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25394351.

The product of its (nonzero) digits is 4500, while the sum is 34.

The spelling of 51061111105561 in words is "fifty-one trillion, sixty-one billion, one hundred eleven million, one hundred five thousand, five hundred sixty-one".