51156771257 has 2 divisors, whose sum is σ = 51156771258. Its totient is φ = 51156771256.

The previous prime is 51156771251. The next prime is 51156771271. The reversal of 51156771257 is 75217765115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46508804281 + 4647966976 = 215659^2 + 68176^2 .

It is a cyclic number.

It is not a de Polignac number, because 51156771257 - 2¹² = 51156767161 is a prime.

It is not a weakly prime, because it can be changed into another prime (51156771251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25578385628 + 25578385629.

It is an arithmetic number, because the mean of its divisors is an integer number (25578385629).

Almost surely, 2^51156771257 is an apocalyptic number.

It is an amenable number.

51156771257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51156771257 is an equidigital number, since it uses as much as digits as its factorization.

51156771257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 514500, while the sum is 47.

The spelling of 51156771257 in words is "fifty-one billion, one hundred fifty-six million, seven hundred seventy-one thousand, two hundred fifty-seven".