51288780551 has 4 divisors (see below), whose sum is σ = 51417971832. Its totient is φ = 51159589272.

The previous prime is 51288780527. The next prime is 51288780553. The reversal of 51288780551 is 15508788215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15508788215 = 5 ⋅3101757643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51288780551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51288780551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51288780553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64595045 + ... + 64595838.

It is an arithmetic number, because the mean of its divisors is an integer number (12854492958).

Almost surely, 2^51288780551 is an apocalyptic number.

51288780551 is a deficient number, since it is larger than the sum of its proper divisors (129191281).

51288780551 is a wasteful number, since it uses less digits than its factorization.

51288780551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129191280.

The product of its (nonzero) digits is 896000, while the sum is 50.

Subtracting from 51288780551 its reverse (15508788215), we obtain a square (35779992336 = 189156²).

The spelling of 51288780551 in words is "fifty-one billion, two hundred eighty-eight million, seven hundred eighty thousand, five hundred fifty-one".