51000561656061 has 4 divisors (see below), whose sum is σ = 68000748874752. Its totient is φ = 34000374437372.

The previous prime is 51000561656041. The next prime is 51000561656063. The reversal of 51000561656061 is 16065616500015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51000561656061 - 2¹¹ = 51000561654013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000561656063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8500093609341 + ... + 8500093609346.

It is an arithmetic number, because the mean of its divisors is an integer number (17000187218688).

Almost surely, 2^{51000561656061} is an apocalyptic number.

It is an amenable number.

51000561656061 is a deficient number, since it is larger than the sum of its proper divisors (17000187218691).

51000561656061 is a wasteful number, since it uses less digits than its factorization.

51000561656061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000187218690.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 51000561656061 in words is "fifty-one trillion, five hundred sixty-one million, six hundred fifty-six thousand, sixty-one".