51142460561 has 4 divisors (see below), whose sum is σ = 54150840612. Its totient is φ = 48134080512.

The previous prime is 51142460549. The next prime is 51142460563. The reversal of 51142460561 is 16506424115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16506424115 = 5 ⋅3301284823.

It can be written as a sum of positive squares in 2 ways, for example, as 47941729936 + 3200730625 = 218956^2 + 56575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51142460561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51142460563) 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, 1504190000 + ... + 1504190033.

It is an arithmetic number, because the mean of its divisors is an integer number (13537710153).

Almost surely, 2^51142460561 is an apocalyptic number.

It is an amenable number.

51142460561 is a deficient number, since it is larger than the sum of its proper divisors (3008380051).

51142460561 is a wasteful number, since it uses less digits than its factorization.

51142460561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008380050.

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 51142460561 its reverse (16506424115), we get a palindrome (67648884676).

The spelling of 51142460561 in words is "fifty-one billion, one hundred forty-two million, four hundred sixty thousand, five hundred sixty-one".