51056050561 has 4 divisors (see below), whose sum is σ = 51056613124. Its totient is φ = 51055488000.

The previous prime is 51056050553. The next prime is 51056050579. The reversal of 51056050561 is 16505065015.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19458855025 + 31597195536 = 139495^2 + 177756^2 .

It is a cyclic number.

It is not a de Polignac number, because 51056050561 - 2³ = 51056050553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51056050531) 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, 110640 + ... + 338161.

It is an arithmetic number, because the mean of its divisors is an integer number (12764153281).

Almost surely, 2^51056050561 is an apocalyptic number.

It is an amenable number.

51056050561 is a deficient number, since it is larger than the sum of its proper divisors (562563).

51056050561 is a wasteful number, since it uses less digits than its factorization.

51056050561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562562.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 51056050561 in words is "fifty-one billion, fifty-six million, fifty thousand, five hundred sixty-one".