51099543811 has 4 divisors (see below), whose sum is σ = 52747916224. Its totient is φ = 49451171400.

The previous prime is 51099543799. The next prime is 51099543821. The reversal of 51099543811 is 11834599015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51099543811 - 2²⁵ = 51065989379 is a prime.

It is a super-2 number, since 2×51099543811² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51099543821) 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 3 ways as a sum of consecutive naturals, for example, 824186160 + ... + 824186221.

It is an arithmetic number, because the mean of its divisors is an integer number (13186979056).

Almost surely, 2^51099543811 is an apocalyptic number.

51099543811 is a deficient number, since it is larger than the sum of its proper divisors (1648372413).

51099543811 is a wasteful number, since it uses less digits than its factorization.

51099543811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648372412.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 51099543811 in words is "fifty-one billion, ninety-nine million, five hundred forty-three thousand, eight hundred eleven".