51149051857 has 2 divisors, whose sum is σ = 51149051858. Its totient is φ = 51149051856.

The previous prime is 51149051843. The next prime is 51149051873. The reversal of 51149051857 is 75815094115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51112618561 + 36433296 = 226081^2 + 6036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51149051857 is a prime.

It is not a weakly prime, because it can be changed into another prime (51149051827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25574525928 + 25574525929.

It is an arithmetic number, because the mean of its divisors is an integer number (25574525929).

Almost surely, 2^51149051857 is an apocalyptic number.

It is an amenable number.

51149051857 is a deficient number, since it is larger than the sum of its proper divisors (1).

51149051857 is an equidigital number, since it uses as much as digits as its factorization.

51149051857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 46.

The spelling of 51149051857 in words is "fifty-one billion, one hundred forty-nine million, fifty-one thousand, eight hundred fifty-seven".