51543424451 has 4 divisors (see below), whose sum is σ = 51813285504. Its totient is φ = 51273563400.

The previous prime is 51543424421. The next prime is 51543424459. The reversal of 51543424451 is 15442434515.

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 51543424451 - 2¹⁰ = 51543423427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51543424459) 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, 134930240 + ... + 134930621.

It is an arithmetic number, because the mean of its divisors is an integer number (12953321376).

Almost surely, 2^51543424451 is an apocalyptic number.

51543424451 is a deficient number, since it is larger than the sum of its proper divisors (269861053).

51543424451 is a wasteful number, since it uses less digits than its factorization.

51543424451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269861052.

The product of its digits is 192000, while the sum is 38.

Adding to 51543424451 its reverse (15442434515), we get a palindrome (66985858966).

The spelling of 51543424451 in words is "fifty-one billion, five hundred forty-three million, four hundred twenty-four thousand, four hundred fifty-one".