51221501072057 has 2 divisors, whose sum is σ = 51221501072058. Its totient is φ = 51221501072056.

The previous prime is 51221501072047. The next prime is 51221501072087. The reversal of 51221501072057 is 75027010512215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46920705317161 + 4300795754896 = 6849869^2 + 2073836^2 .

It is a cyclic number.

It is not a de Polignac number, because 51221501072057 - 2³⁴ = 51204321202873 is a prime.

It is a super-2 number, since 2×51221501072057² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51221501072057.

It is not a weakly prime, because it can be changed into another prime (51221501072047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25610750536028 + 25610750536029.

It is an arithmetic number, because the mean of its divisors is an integer number (25610750536029).

Almost surely, 2^{51221501072057} is an apocalyptic number.

It is an amenable number.

51221501072057 is a deficient number, since it is larger than the sum of its proper divisors (1).

51221501072057 is an equidigital number, since it uses as much as digits as its factorization.

51221501072057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49000, while the sum is 38.

The spelling of 51221501072057 in words is "fifty-one trillion, two hundred twenty-one billion, five hundred one million, seventy-two thousand, fifty-seven".