51105510009 has 16 divisors (see below), whose sum is σ = 78154186240. Its totient is φ = 32971296240.

The previous prime is 51105509999. The next prime is 51105510011. The reversal of 51105510009 is 90001550115.

It is not a de Polignac number, because 51105510009 - 2¹³ = 51105501817 is a prime.

It is a super-2 number, since 2×51105510009² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51105510409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30528142 + ... + 30529815.

It is an arithmetic number, because the mean of its divisors is an integer number (4884636640).

Almost surely, 2^51105510009 is an apocalyptic number.

It is an amenable number.

51105510009 is a deficient number, since it is larger than the sum of its proper divisors (27048676231).

51105510009 is a wasteful number, since it uses less digits than its factorization.

51105510009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61057997 (or 61057991 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 27.

The spelling of 51105510009 in words is "fifty-one billion, one hundred five million, five hundred ten thousand, nine".