51213053551 has 8 divisors (see below), whose sum is σ = 55888937424. Its totient is φ = 46540528320.

The previous prime is 51213053513. The next prime is 51213053599. The reversal of 51213053551 is 15535031215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51213053551 - 2¹¹ = 51213051503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213053251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807720 + ... + 868813.

It is an arithmetic number, because the mean of its divisors is an integer number (6986117178).

Almost surely, 2^51213053551 is an apocalyptic number.

51213053551 is a deficient number, since it is larger than the sum of its proper divisors (4675883873).

51213053551 is a wasteful number, since it uses less digits than its factorization.

51213053551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679321.

The product of its (nonzero) digits is 11250, while the sum is 31.

Adding to 51213053551 its reverse (15535031215), we get a palindrome (66748084766).

The spelling of 51213053551 in words is "fifty-one billion, two hundred thirteen million, fifty-three thousand, five hundred fifty-one".