51430012173 has 12 divisors (see below), whose sum is σ = 76295574108. Its totient is φ = 33360007680.

The previous prime is 51430012169. The next prime is 51430012177. The reversal of 51430012173 is 37121003415.

51430012173 is a `hidden beast` number, since 51 + 430 + 0 + 12 + 173 = 666.

It is an interprime number because it is at equal distance from previous prime (51430012169) and next prime (51430012177).

It can be written as a sum of positive squares in 2 ways, for example, as 30625700004 + 20804312169 = 175002^2 + 144237^2 .

It is not a de Polignac number, because 51430012173 - 2² = 51430012169 is a prime.

It is a super-2 number, since 2×51430012173² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51430012177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77221908 + ... + 77222573.

It is an arithmetic number, because the mean of its divisors is an integer number (6357964509).

Almost surely, 2^51430012173 is an apocalyptic number.

It is an amenable number.

51430012173 is a deficient number, since it is larger than the sum of its proper divisors (24865561935).

51430012173 is a wasteful number, since it uses less digits than its factorization.

51430012173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154444524 (or 154444521 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

Adding to 51430012173 its reverse (37121003415), we get a palindrome (88551015588).

The spelling of 51430012173 in words is "fifty-one billion, four hundred thirty million, twelve thousand, one hundred seventy-three".