51656505029 has 2 divisors, whose sum is σ = 51656505030. Its totient is φ = 51656505028.

The previous prime is 51656505007. The next prime is 51656505079. The reversal of 51656505029 is 92050565615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42363930625 + 9292574404 = 205825^2 + 96398^2 .

It is a cyclic number.

It is not a de Polignac number, because 51656505029 - 2²⁸ = 51388069573 is a prime.

It is a super-2 number, since 2×51656505029² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51656505079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25828252514 + 25828252515.

It is an arithmetic number, because the mean of its divisors is an integer number (25828252515).

Almost surely, 2^51656505029 is an apocalyptic number.

It is an amenable number.

51656505029 is a deficient number, since it is larger than the sum of its proper divisors (1).

51656505029 is an equidigital number, since it uses as much as digits as its factorization.

51656505029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 51656505029 in words is "fifty-one billion, six hundred fifty-six million, five hundred five thousand, twenty-nine".