51647085257 has 2 divisors, whose sum is σ = 51647085258. Its totient is φ = 51647085256.

The previous prime is 51647085251. The next prime is 51647085299. The reversal of 51647085257 is 75258074615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49417734601 + 2229350656 = 222301^2 + 47216^2 .

It is a cyclic number.

It is not a de Polignac number, because 51647085257 - 2⁸ = 51647085001 is a prime.

It is not a weakly prime, because it can be changed into another prime (51647085251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25823542628 + 25823542629.

It is an arithmetic number, because the mean of its divisors is an integer number (25823542629).

Almost surely, 2^51647085257 is an apocalyptic number.

It is an amenable number.

51647085257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51647085257 is an equidigital number, since it uses as much as digits as its factorization.

51647085257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 51647085257 in words is "fifty-one billion, six hundred forty-seven million, eighty-five thousand, two hundred fifty-seven".