51050510561 has 2 divisors, whose sum is σ = 51050510562. Its totient is φ = 51050510560.

The previous prime is 51050510551. The next prime is 51050510579. The reversal of 51050510561 is 16501505015.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48562496161 + 2488014400 = 220369^2 + 49880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51050510561 is a prime.

It is not a weakly prime, because it can be changed into another prime (51050510521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25525255280 + 25525255281.

It is an arithmetic number, because the mean of its divisors is an integer number (25525255281).

Almost surely, 2^51050510561 is an apocalyptic number.

It is an amenable number.

51050510561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51050510561 is an equidigital number, since it uses as much as digits as its factorization.

51050510561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 51050510561 in words is "fifty-one billion, fifty million, five hundred ten thousand, five hundred sixty-one".