51061005561061 has 6 divisors (see below), whose sum is σ = 53889870135462. Its totient is φ = 48373584215400.

The previous prime is 51061005561031. The next prime is 51061005561073. The reversal of 51061005561061 is 16016550016015.

It can be written as a sum of positive squares in only one way, i.e., 44532852810436 + 6528152750625 = 6673294^2 + 2555025^2 .

It is not a de Polignac number, because 51061005561061 - 2²¹ = 51061003463909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51061005561061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51061005561031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70721613990 + ... + 70721614711.

It is an arithmetic number, because the mean of its divisors is an integer number (8981645022577).

Almost surely, 2^{51061005561061} is an apocalyptic number.

It is an amenable number.

51061005561061 is a deficient number, since it is larger than the sum of its proper divisors (2828864574401).

51061005561061 is a wasteful number, since it uses less digits than its factorization.

51061005561061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141443228739 (or 141443228720 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 37.

Adding to 51061005561061 its reverse (16016550016015), we get a palindrome (67077555577076).

The spelling of 51061005561061 in words is "fifty-one trillion, sixty-one billion, five million, five hundred sixty-one thousand, sixty-one".