51554322143 has 4 divisors (see below), whose sum is σ = 52260545808. Its totient is φ = 50848098480.

The previous prime is 51554322101. The next prime is 51554322151. The reversal of 51554322143 is 34122345515.

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-51554322143 is a prime.

It is a super-2 number, since 2×51554322143² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51554322173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353111723 + ... + 353111868.

It is an arithmetic number, because the mean of its divisors is an integer number (13065136452).

Almost surely, 2^51554322143 is an apocalyptic number.

51554322143 is a deficient number, since it is larger than the sum of its proper divisors (706223665).

51554322143 is an equidigital number, since it uses as much as digits as its factorization.

51554322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706223664.

The product of its digits is 72000, while the sum is 35.

Adding to 51554322143 its reverse (34122345515), we get a palindrome (85676667658).

The spelling of 51554322143 in words is "fifty-one billion, five hundred fifty-four million, three hundred twenty-two thousand, one hundred forty-three".