51105509999 has 2 divisors, whose sum is σ = 51105510000. Its totient is φ = 51105509998.

The previous prime is 51105509989. The next prime is 51105510011. The reversal of 51105509999 is 99990550115.

51105509999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51105509999 - 2⁸ = 51105509743 is a prime.

It is a super-2 number, since 2×51105509999² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51105509999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51105509989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25552754999 + 25552755000.

It is an arithmetic number, because the mean of its divisors is an integer number (25552755000).

Almost surely, 2^51105509999 is an apocalyptic number.

51105509999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51105509999 is an equidigital number, since it uses as much as digits as its factorization.

51105509999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 820125, while the sum is 53.

The spelling of 51105509999 in words is "fifty-one billion, one hundred five million, five hundred nine thousand, nine hundred ninety-nine".