51022511257 has 2 divisors, whose sum is σ = 51022511258. Its totient is φ = 51022511256.

The previous prime is 51022511209. The next prime is 51022511263. The reversal of 51022511257 is 75211522015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46827228816 + 4195282441 = 216396^2 + 64771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51022511257 is a prime.

It is not a weakly prime, because it can be changed into another prime (51022511957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511255628 + 25511255629.

It is an arithmetic number, because the mean of its divisors is an integer number (25511255629).

Almost surely, 2^51022511257 is an apocalyptic number.

It is an amenable number.

51022511257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51022511257 is an equidigital number, since it uses as much as digits as its factorization.

51022511257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 51022511257 in words is "fifty-one billion, twenty-two million, five hundred eleven thousand, two hundred fifty-seven".