51656615093 has 2 divisors, whose sum is σ = 51656615094. Its totient is φ = 51656615092.

The previous prime is 51656615077. The next prime is 51656615141. The reversal of 51656615093 is 39051665615.

51656615093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47981588209 + 3675026884 = 219047^2 + 60622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51656615093 - 2⁴ = 51656615077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51656615393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25828307546 + 25828307547.

It is an arithmetic number, because the mean of its divisors is an integer number (25828307547).

Almost surely, 2^51656615093 is an apocalyptic number.

It is an amenable number.

51656615093 is a deficient number, since it is larger than the sum of its proper divisors (1).

51656615093 is an equidigital number, since it uses as much as digits as its factorization.

51656615093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 47.

The spelling of 51656615093 in words is "fifty-one billion, six hundred fifty-six million, six hundred fifteen thousand, ninety-three".