51256156541 has 2 divisors, whose sum is σ = 51256156542. Its totient is φ = 51256156540.

The previous prime is 51256156513. The next prime is 51256156547. The reversal of 51256156541 is 14565165215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32780550916 + 18475605625 = 181054^2 + 135925^2 .

It is a cyclic number.

It is not a de Polignac number, because 51256156541 - 2³⁰ = 50182414717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51256156547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25628078270 + 25628078271.

It is an arithmetic number, because the mean of its divisors is an integer number (25628078271).

Almost surely, 2^51256156541 is an apocalyptic number.

It is an amenable number.

51256156541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51256156541 is an equidigital number, since it uses as much as digits as its factorization.

51256156541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 41.

The spelling of 51256156541 in words is "fifty-one billion, two hundred fifty-six million, one hundred fifty-six thousand, five hundred forty-one".