51561051053 has 2 divisors, whose sum is σ = 51561051054. Its totient is φ = 51561051052.

The previous prime is 51561051043. The next prime is 51561051083. The reversal of 51561051053 is 35015016515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51491778724 + 69272329 = 226918^2 + 8323^2 .

It is a cyclic number.

It is not a de Polignac number, because 51561051053 - 2⁸ = 51561050797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51561051043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25780525526 + 25780525527.

It is an arithmetic number, because the mean of its divisors is an integer number (25780525527).

Almost surely, 2^51561051053 is an apocalyptic number.

It is an amenable number.

51561051053 is a deficient number, since it is larger than the sum of its proper divisors (1).

51561051053 is an equidigital number, since it uses as much as digits as its factorization.

51561051053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 32.

Adding to 51561051053 its reverse (35015016515), we get a palindrome (86576067568).

The spelling of 51561051053 in words is "fifty-one billion, five hundred sixty-one million, fifty-one thousand, fifty-three".