51005510509 has 16 divisors (see below), whose sum is σ = 53012215872. Its totient is φ = 49040466048.

The previous prime is 51005510497. The next prime is 51005510513. The reversal of 51005510509 is 90501550015.

51005510509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51005510509 - 2¹⁷ = 51005379437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005510599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 962817 + ... + 1014409.

It is an arithmetic number, because the mean of its divisors is an integer number (3313263492).

Almost surely, 2^51005510509 is an apocalyptic number.

It is an amenable number.

51005510509 is a deficient number, since it is larger than the sum of its proper divisors (2006705363).

51005510509 is a wasteful number, since it uses less digits than its factorization.

51005510509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51996.

The product of its (nonzero) digits is 5625, while the sum is 31.

The spelling of 51005510509 in words is "fifty-one billion, five million, five hundred ten thousand, five hundred nine".