51147145054561 has 4 divisors (see below), whose sum is σ = 51274694045124. Its totient is φ = 51019596064000.

The previous prime is 51147145054547. The next prime is 51147145054567. The reversal of 51147145054561 is 16545054174115.

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 41043806023936 + 10103339030625 = 6406544^2 + 3178575^2 .

It is a cyclic number.

It is not a de Polignac number, because 51147145054561 - 2⁷ = 51147145054433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51147145054567) 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, 63774494680 + ... + 63774495481.

It is an arithmetic number, because the mean of its divisors is an integer number (12818673511281).

Almost surely, 2^{51147145054561} is an apocalyptic number.

It is an amenable number.

51147145054561 is a deficient number, since it is larger than the sum of its proper divisors (127548990563).

51147145054561 is a wasteful number, since it uses less digits than its factorization.

51147145054561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127548990562.

The product of its (nonzero) digits is 1680000, while the sum is 49.

The spelling of 51147145054561 in words is "fifty-one trillion, one hundred forty-seven billion, one hundred forty-five million, fifty-four thousand, five hundred sixty-one".