51051100555561 has 4 divisors (see below), whose sum is σ = 54054106470612. Its totient is φ = 48048094640512.

The previous prime is 51051100555549. The next prime is 51051100555627. The reversal of 51051100555561 is 16555500115015.

It is a happy number.

51051100555561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38710247723536 + 12340852832025 = 6221756^2 + 3512955^2 .

It is a cyclic number.

It is not a de Polignac number, because 51051100555561 - 2¹¹ = 51051100553513 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51051100555531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501502957500 + ... + 1501502957533.

It is an arithmetic number, because the mean of its divisors is an integer number (13513526617653).

Almost surely, 2^{51051100555561} is an apocalyptic number.

It is an amenable number.

51051100555561 is a deficient number, since it is larger than the sum of its proper divisors (3003005915051).

51051100555561 is a wasteful number, since it uses less digits than its factorization.

51051100555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003005915050.

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 51051100555561 in words is "fifty-one trillion, fifty-one billion, one hundred million, five hundred fifty-five thousand, five hundred sixty-one".