51489945851 has 2 divisors, whose sum is σ = 51489945852. Its totient is φ = 51489945850.

The previous prime is 51489945839. The next prime is 51489945863. The reversal of 51489945851 is 15854998415.

It is a balanced prime because it is at equal distance from previous prime (51489945839) and next prime (51489945863).

It is a cyclic number.

It is not a de Polignac number, because 51489945851 - 2¹⁴ = 51489929467 is a prime.

It is a super-2 number, since 2×51489945851² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51489945811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25744972925 + 25744972926.

It is an arithmetic number, because the mean of its divisors is an integer number (25744972926).

Almost surely, 2^51489945851 is an apocalyptic number.

51489945851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489945851 is an equidigital number, since it uses as much as digits as its factorization.

51489945851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368000, while the sum is 59.

The spelling of 51489945851 in words is "fifty-one billion, four hundred eighty-nine million, nine hundred forty-five thousand, eight hundred fifty-one".