51000055551 has 12 divisors (see below), whose sum is σ = 73668961080. Its totient is φ = 33999015120.

The previous prime is 51000055549. The next prime is 51000055591. The reversal of 51000055551 is 15555000015.

51000055551 is a `hidden beast` number, since 5 + 100 + 0 + 0 + 5 + 5 + 551 = 666.

It is not a de Polignac number, because 51000055551 - 2¹ = 51000055549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000055541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345580 + ... + 470558.

It is an arithmetic number, because the mean of its divisors is an integer number (6139080090).

Almost surely, 2^51000055551 is an apocalyptic number.

51000055551 is a deficient number, since it is larger than the sum of its proper divisors (22668905529).

51000055551 is a wasteful number, since it uses less digits than its factorization.

51000055551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170326 (or 170323 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 27.

Adding to 51000055551 its reverse (15555000015), we get a palindrome (66555055566).

The spelling of 51000055551 in words is "fifty-one billion, fifty-five thousand, five hundred fifty-one".