51566272789 has 2 divisors, whose sum is σ = 51566272790. Its totient is φ = 51566272788.

The previous prime is 51566272777. The next prime is 51566272799. The reversal of 51566272789 is 98727266515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28137378564 + 23428894225 = 167742^2 + 153065^2 .

It is a cyclic number.

It is not a de Polignac number, because 51566272789 - 2¹³ = 51566264597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51566272799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25783136394 + 25783136395.

It is an arithmetic number, because the mean of its divisors is an integer number (25783136395).

Almost surely, 2^51566272789 is an apocalyptic number.

It is an amenable number.

51566272789 is a deficient number, since it is larger than the sum of its proper divisors (1).

51566272789 is an equidigital number, since it uses as much as digits as its factorization.

51566272789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 58.

The spelling of 51566272789 in words is "fifty-one billion, five hundred sixty-six million, two hundred seventy-two thousand, seven hundred eighty-nine".