51487169257 has 2 divisors, whose sum is σ = 51487169258. Its totient is φ = 51487169256.

The previous prime is 51487169249. The next prime is 51487169287. The reversal of 51487169257 is 75296178415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47290591296 + 4196577961 = 217464^2 + 64781^2 .

It is a cyclic number.

It is not a de Polignac number, because 51487169257 - 2³ = 51487169249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51487169198 and 51487169207.

It is not a weakly prime, because it can be changed into another prime (51487169287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25743584628 + 25743584629.

It is an arithmetic number, because the mean of its divisors is an integer number (25743584629).

Almost surely, 2^51487169257 is an apocalyptic number.

It is an amenable number.

51487169257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51487169257 is an equidigital number, since it uses as much as digits as its factorization.

51487169257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 55.

The spelling of 51487169257 in words is "fifty-one billion, four hundred eighty-seven million, one hundred sixty-nine thousand, two hundred fifty-seven".