51551155211 has 4 divisors (see below), whose sum is σ = 51747167472. Its totient is φ = 51355142952.

The previous prime is 51551155163. The next prime is 51551155213. The reversal of 51551155211 is 11255115515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51551155211 is a prime.

It is a super-2 number, since 2×51551155211² (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 (51551155213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98005736 + ... + 98006261.

It is an arithmetic number, because the mean of its divisors is an integer number (12936791868).

Almost surely, 2^51551155211 is an apocalyptic number.

51551155211 is a deficient number, since it is larger than the sum of its proper divisors (196012261).

51551155211 is a wasteful number, since it uses less digits than its factorization.

51551155211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196012260.

The product of its digits is 6250, while the sum is 32.

The spelling of 51551155211 in words is "fifty-one billion, five hundred fifty-one million, one hundred fifty-five thousand, two hundred eleven".