51135505665077 has 2 divisors, whose sum is σ = 51135505665078. Its totient is φ = 51135505665076.

The previous prime is 51135505665019. The next prime is 51135505665107. The reversal of 51135505665077 is 77056650553115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50516712615121 + 618793049956 = 7107511^2 + 786634^2 .

It is a cyclic number.

It is not a de Polignac number, because 51135505665077 - 2²⁰ = 51135504616501 is a prime.

It is a super-2 number, since 2×51135505665077² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51135505625077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25567752832538 + 25567752832539.

It is an arithmetic number, because the mean of its divisors is an integer number (25567752832539).

Almost surely, 2^{51135505665077} is an apocalyptic number.

It is an amenable number.

51135505665077 is a deficient number, since it is larger than the sum of its proper divisors (1).

51135505665077 is an equidigital number, since it uses as much as digits as its factorization.

51135505665077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16537500, while the sum is 56.

The spelling of 51135505665077 in words is "fifty-one trillion, one hundred thirty-five billion, five hundred five million, six hundred sixty-five thousand, seventy-seven".